Finally a serious post lol. Might as well give my actual predictions...
*Direct opens up with Isaac's trailer which may or may not have a Felix Echo Fighter. Venus Lighthouse is the multiplayer stage and Mars Lighthouse is the boss stage where you fight the Doom Dragon. Alex is an Assist Trophy and the Doom Dragon is a Boss in the new Spirits Mode. The Golden Sun item (Growth Psynergy) is also shown*
*Ken, Shadow, and Mach Rider are the last Echo Fighters (MR can go either way if he/she is actually in the game)
*Online play is talked in detail along with the new feature (the 32 player thing). For Fun has features found in local multiplayer and For Glory is overhauled in that stages include Battlefield forms in addition to FD ones*
*Vault content is shown off in full (Trophies, Replays, Sound Test/My Music, Snapshots, Trailers, what have you) . Trophies now exceed 1,000 and Stickers make a return from Brawl (IDK why lol). Masterpieces are limited to the NES catalog from the Switch Online Membership (sucks I know). And if there's any justice in the world, Coin Launcher is going to return from Brawl along with it's sweet track.
New features are shown off as well not in any previous Smash game.*
*Challenges are back in full force and include over 200 challenges to complete though this time the player get 10 Golden Hammers instead of 5.*
*Classic Mode is shown off again briefly and the end boss is shown off. Hopefully in the old style of difficulty where it goes from Very Easy-Very Hard or like Brawl where it goes from Easy-Intense. Break the Targets, Race to the Finish, and another new mode are included as well.*
*All-Star Mode is overhauled given how big the roster is and is now a Survival Mode. Pitting you against the entire Smash roster by 1's, 2's, and 3's at random until you lose.*
*Event matches return and are more or less the same.*
*The last Assist Trophies are shown off.*
*Geno's trailer is shown in full and whatever. Black Mage is introduces as SE's Assist Trophy.*
*Spirits Mode gets talked about in great detail and is a mid-point between Melee's Adventure Mode and Brawl's Subspace. Being that it's like Melee's but with Brawl's bosses and small cutscenes to introduce the bosses.
*The Direct ends with Sakurai thanking everyone for supporting the series and he hopes we all enjoy Smash Bros Ultimate when it comes out*
*The Direct fades to black but right before Treehouse Live starts, we hear a
familiar sound teasing something for the future.*