My Theories (Nintendo Centric)
TK Theories
-Fatal Frame U fully revealed to the public.
-Hyrule Warriors also showcased.
-Ninja Gaiden will be exclusive to Wii U or at least be available for it with U features.
-Tecmo Koei and Nintendo enter an "unprecedented partnership".
-New Warriors game for all platforms including last-gen.
Squeenix Theories
-Yet another KH spin-off that further delays the already Duke Nukem Forever level of vaporware that KH3 is. Will introduce further unneeded plot twists. May or may not be for both handhelds or an exclusive deal with either Microsoft or Nintendo to attract the JRPG crowd to either platform.
-Nomura announces that FFXIII Versus/FFXV will finally be released next year with the addition of both PC and Wii U as a platform for both KH3 and FFXV. (A PC gamer can dream.)
-A new Deus Ex with it's father, Warren Spector, helming it himself. Will most likely be available for PS4/XBO/PC/WiiU as Warren is very favourable towards the U and PC in general.
-The Hitman we've all been waiting for is announced. It hopefully lives up to the hype and replaced Blood Money as everyone's favorite.
-Bravely Default 2 localization date is announced.
-A refocus on JRPGs is promised. Whether it comes to be can't be predicted.
-FFXIV Expansion Pack trailer.
-Square is publishing Just Cause 3. Avalanche Studios will still be working on this one after Mad Max. No screenshots.
-Square will finally rekindle their old Nintendo friendship and will support the Wii U with their in-house offerings.
Ubisoft Theories
-The two new AC's are shown. One flops or will be AC3 quality. The other will at least be AC4 level.
(Far Out) -The Division will get a visual upgrade thanks to Ubisoft Massive's experience with the x86 architecture. PC announced as lead platform. Snowdrop Engine to be used as one of Ubisoft's main engines to combat EA's Frostbite. Will be powering The Crew. Anvil Engine scrapped because of bad optimization on x86. Dunia scrapped because Ubisoft wants one unified engine.
-Footage of new Rainbow Six, Far Cry, Just Dance and Brothers In Arms shown.
Activision Theories
-CoD 2015 under Sledgehammer Games is shown. Will finally be using a new, Treyarch developed engine that is considerably taking advantage of current-gen features.
-Warlords Of Draenor teaser for Blizzcon shown.
-Starcraft 2 Protoss Expansion release date announced. Will revamp the metagame and give a new life to the competitive scene, according to them at their press conference.
-Heroes Of The Storm beta keys given to all journalists at the event. Demo also playable on-site.
-More Hearthstone goodness.
-High Moon Studios makes a known IP game. Might be Transformers.
-New Marvel Squad game in the vein of Ultimate Alliance and X-Men Legends.
-New Rhythm game to combat Harmonix's next release.
Sega Theories
-New Yakuza localized for PS4.
-A new Sonic game that's not Sonic Boom.
-Sonic Boom news. It will be good.
-Nintendo exclusive deal. Most likely a new F-Zero. Might be made by Sumo Digital, makers of Sonic & All Stars Racing.
-New Total War made by a B-team.
-More Aliens: Infestation news.
-Relic RTS.
-News about Atlus published games like Citizens Of Earth.
-Persona: Dancing, Persona Q, Persona Arena 2 and Persona 5 news. No one can get over Rise.
Nintendo Theories
-Sega F-Zero.
-Why Reggie wearing the Metroid Pin at VGX is revealed.
-Hyrule Warriors.
-Monolith's X details.
-Fatal Frame U.
-SMT X FE is finally fully shown to the public.
-Yarn Yoshi.
-Mario Party or Mario RPG U.
-Retro's new title which may or may not be Metroid.
-Miyamoto shows his new IP off.
-Animal Crossing U.
-Wii U's VC handed off to indieszero and that other VC porting crew and the whole library will be complete just to one-up Sony.
-Wii U Slim. Will launch a big advert campaign to promote it.
-Smash Bros. release date confirmed.
I'll leave the Smash theories to you guys.
TK Theories
-Fatal Frame U fully revealed to the public.
-Hyrule Warriors also showcased.
-Ninja Gaiden will be exclusive to Wii U or at least be available for it with U features.
-Tecmo Koei and Nintendo enter an "unprecedented partnership".
-New Warriors game for all platforms including last-gen.
Squeenix Theories
-Yet another KH spin-off that further delays the already Duke Nukem Forever level of vaporware that KH3 is. Will introduce further unneeded plot twists. May or may not be for both handhelds or an exclusive deal with either Microsoft or Nintendo to attract the JRPG crowd to either platform.
-Nomura announces that FFXIII Versus/FFXV will finally be released next year with the addition of both PC and Wii U as a platform for both KH3 and FFXV. (A PC gamer can dream.)
-A new Deus Ex with it's father, Warren Spector, helming it himself. Will most likely be available for PS4/XBO/PC/WiiU as Warren is very favourable towards the U and PC in general.
-The Hitman we've all been waiting for is announced. It hopefully lives up to the hype and replaced Blood Money as everyone's favorite.
-Bravely Default 2 localization date is announced.
-A refocus on JRPGs is promised. Whether it comes to be can't be predicted.
-FFXIV Expansion Pack trailer.
-Square is publishing Just Cause 3. Avalanche Studios will still be working on this one after Mad Max. No screenshots.
-Square will finally rekindle their old Nintendo friendship and will support the Wii U with their in-house offerings.
Ubisoft Theories
-The two new AC's are shown. One flops or will be AC3 quality. The other will at least be AC4 level.
(Far Out) -The Division will get a visual upgrade thanks to Ubisoft Massive's experience with the x86 architecture. PC announced as lead platform. Snowdrop Engine to be used as one of Ubisoft's main engines to combat EA's Frostbite. Will be powering The Crew. Anvil Engine scrapped because of bad optimization on x86. Dunia scrapped because Ubisoft wants one unified engine.
-Footage of new Rainbow Six, Far Cry, Just Dance and Brothers In Arms shown.
Activision Theories
-CoD 2015 under Sledgehammer Games is shown. Will finally be using a new, Treyarch developed engine that is considerably taking advantage of current-gen features.
-Warlords Of Draenor teaser for Blizzcon shown.
-Starcraft 2 Protoss Expansion release date announced. Will revamp the metagame and give a new life to the competitive scene, according to them at their press conference.
-Heroes Of The Storm beta keys given to all journalists at the event. Demo also playable on-site.
-More Hearthstone goodness.
-High Moon Studios makes a known IP game. Might be Transformers.
-New Marvel Squad game in the vein of Ultimate Alliance and X-Men Legends.
-New Rhythm game to combat Harmonix's next release.
Sega Theories
-New Yakuza localized for PS4.
-A new Sonic game that's not Sonic Boom.
-Sonic Boom news. It will be good.
-Nintendo exclusive deal. Most likely a new F-Zero. Might be made by Sumo Digital, makers of Sonic & All Stars Racing.
-New Total War made by a B-team.
-More Aliens: Infestation news.
-Relic RTS.
-News about Atlus published games like Citizens Of Earth.
-Persona: Dancing, Persona Q, Persona Arena 2 and Persona 5 news. No one can get over Rise.
Nintendo Theories
-Sega F-Zero.
-Why Reggie wearing the Metroid Pin at VGX is revealed.
-Hyrule Warriors.
-Monolith's X details.
-Fatal Frame U.
-SMT X FE is finally fully shown to the public.
-Yarn Yoshi.
-Mario Party or Mario RPG U.
-Retro's new title which may or may not be Metroid.
-Miyamoto shows his new IP off.
-Animal Crossing U.
-Wii U's VC handed off to indieszero and that other VC porting crew and the whole library will be complete just to one-up Sony.
-Wii U Slim. Will launch a big advert campaign to promote it.
-Smash Bros. release date confirmed.
I'll leave the Smash theories to you guys.