I’ve made a newcomer prediction analysis based off the “leaks”, “rumours” and “hints” from semi-reliable sources/ individuals in the industry and also based off the first trailer. (Basically all/ any possible information we have so far) Not saying these are going to happen, but it's just looking at the possibilities and my opinionated likelihood.
Row One: The soft reveals of Inkling and BotW Link. Inklings sporting their Wii U appearance, and BotW was also on the Wii U. This could suggest that Wii U titles will be a bigger focus then the Switch titles, given the development time line.
Row Two: Ridley, Ice Climbers, Simon Belmont. These characters have been stated to be included in the latest GameFAQ’s leak. Ridley has been hinted at by others with “insider” connections. The Ice Climbers had some unused assets in Smash 4 and were cut due to the 3DS’s limitations. Simon Belmont is interesting, suggesting Konami is back in the fold.
Row Three: Alph, according to Sakurai would have been his own character with Rock Pikmin, but wasn’t due to time constraints. Perhaps this time around for Smash 5, Sakurai will include him as a standalone character. This would coincide with the rumours of being “the most complete Smash Bros ever”.
Row Four: This row is the cut Smash 4 veterans who are far more glaring then others. I feel if the Belmont rumour is true it drastically increases the odds of Snake’s return, because as we know they’re both Konami properties. Wolf’s inclusion in Smash 5 exists because of the “most complete smash bros ever” rumour. His popularity and modest backlash from Smash 4 increase his odds to return.
Row Five: The cut Pokemon. It appears as though Kanto may be gaining traction again as the new Pokemon Switch game may be a Kanto story. This could shine light back on Squirtle and Ivysaur. As far as Pichu is concerned, well he’s a vet and the whole “most complete Smash Bros ever” applies to the trio.
Row Six: This is far more highly speculative, but if the Wii U games is going to be the greater focus for characters (Inkling’s design and BotW Link). I imagine the more successful games such as Koei Tecmo’s Hyrule Warriors may be looked at. With that being said, Koei Tecmo is the last major Japanese video game company not involved with Smash. KT had a lot of support for the Wii U including Fatal Frame exclusivity. I’m not sure but Sakurai may favour some of the Warriors designs for less common LoZ characters. If Young Link is brought back, which could happen for a few reasons, one being completeness another being because Link is overhauled into BotW Link and Sakurai wants the old move set to remain by handing it down to Young Link. Ryu Hayabusa is a character with a long history on Nintendo consoles and is basically KT’s poster boy. Very speculative but if you consider the popularity of Hyrule Warriors, the dev time, KT’s relationship with Nintendo, Ryu Hayabusa’s history… it in my opinion creates a picture of possibility, not guaranteed but the possibility is surely there for KT inclusion.
Row Seven: Is basically dedicated to characters recognized for their popularity by Sakurai by including them in Smash 4 in some way, shape or form. I think their fan demand, AT’s, Mii costumes, and the ballot effect the odds of these characters more-so than others. The fact Sakurai has acknowledged them appears to bold well for their possible future inclusion.