Okay so I'll do my list:
1) Zelda Breath of the Wild 2: I think it's the most likely. It's gonna be Nintendo's biggest launch of next year (unless they release Mario Kart or 3D Mario surpasses Zelda this time). It's already hyped and can get even more hyped up. Also we're all eager to see more. And as
@MaitreWakou said, Bill Trinen did say at E3 we would see the game again before the end of the year.
2) Resident Evil Outrage: I was thinking why people were bringing it up, then I remembered Resident Evil is more of an early year release. If they aim for a May launch like Village or March like MHR, it's the perfect spot to announce it. Tbh honest that announcement alone would be enough for all the spotlights going to Nintendo Switch, after all the praise the franchise has been receiving since VII. Would generate a lot of buzz. And it's not like there's any later date to announce a game coming in spring.
3) Metroid Prime Remakester/4: that would be the most likely, even more likely than Zelda if it wasn't for the 4 factor. Showing the remake without showing 4 would be misleading, and showing a game aiming for 2023 might not be the most Nintendo thing to do. Also there's the fact that announcing that just two months after Dread might take away its shine - even tho it can also put even more lights in Metroid. I will go dreaming to see it knowing I might have to wait till E3.
From now on it's stuff I don't really think will be there, but would somewhat make sense and other users are mentioning. Also guessing an unexpected surprise is fun.
4) Xenoblade Chronicles 3: I don't recall anything Xenoblade at the TGA? But it might be a good opportunity to get more eyes on the franchise. If it's really polished and has appealing graphics it might aim for open world enthusiasts and western RPG fans. Also BDII was a TGA announcement, and Joker for Smash got everyone going orgasmic so it's not like JRPGs and anime designs can't generate loads of hype. I'm excited to see this game but don't know whether I expect it or not. Would be cool to see it shown and releasing by may-july.
5) Donkey Kong by EPD Tokyo: they have to announce it some day and it's probably very close to completion. It might be a good opportunity to give DK the spotlight, as it being an E3 reveal might get it overshadowed by Zelda. Also it's a dormant IP as far as new games go, and it's pretty western centric and usually graphic appealing so it's a great chance. I don't think it'll be there but I'll love to see it. Also it'll be the spiritual successor to Cranky Kong in 2013.
6) Super Mario Odyssey 2/ whatever the next 3D Mario is: Mario is in a weird spot where it's the most popular franchise, the most acclaimed franchise (alongside Zelda), the best selling franchise(Mario as a whole) and yet it doesn't use the hype machine a lot. Maybe because it doesn't really need to? It's a be awkward that Zelda games are announced 2-4 years ahead of release and Mario is announced at E3 to release the same year. I don't think it should be announced way ahead, I don't even think Zelda should, but a 15-18 month hype cycle like Super Mario Galaxy, Super Mario Maker or Super Smash Bros for Wii U/3DS had, where it's announced at E3 for the fall of the following year, is pretty great to me. Balance of having a hype building up without going radio silent or waiting years for information. I always dreamed with Mario getting emotionally and edgy appealing like Zelda, SMO almost did, in fact Galaxy did I think. I would love to see Super Mario Odyssey 2: Subtitle being revealed at The Games Awards in a way similar to how SMO was shown at the Switch showcase or E3, where in the beginning you guess 30000 games but Mario, then having some CG-i/cutscenes drama, emotional Rosalina, huuuuuuuuge areas, etc, and then in the end the release year. Really just take Jan 2017 BotW trailer or E3 2021 BotW 2 trailer and make a t Mario. Make some people cry of emotion. I mean everyone because everyone loves Mario. It's just a fanfic tho, 100% not happening. I'll be overly pessimistic about it. So it'll happen.