They've held off on Prime 4 for so long, I expect it to be part of the main Switch 2 reveal, not this mini direct.

s-so..... s-son.... Deltarune

I feel like Metroid will feature in the Switch 2 direct, and there was a Pokemon direct very recently, so it's either going to be something we don't expect or a bit underwhelming. I'm thinking some thrid-party titles.

Thinking about it more though, perhaps they do have something big enough to justify a separate Switch 1 Direct a week before the Switch 2 Direct. The question is, what could it be, what's the biggest thing they wouldn't save for Switch 2?

• Last we heard, Prime 4 is still a Switch 1 game, though it really ought to be cross-gen at this point. I'm sure it'll be in either tomorrow's Direct or next week's. The fact that there is a Direct tomorrow means I'm leaning towards this being the heavy hitter that justifies having a Switch 1 Direct. If it's not though, we could see Prime 2/3 tomorrow and 4 next week.

• Galaxy 2 seems like an obvious pick, people have been wondering where it is ever since it wasn't in 3D All Stars. It's too much of a safe pick to be the headliner though.

• I'm hoping we see some cult classic brought back, something that will get a few people really really excited. F-Zero GX immediately comes to mind. But also, after they teased us with 99, we need a new F-Zero more than we need a remaster.
  Mother 3 would break the internet, if it were to ever happen this would be the time to do it, but we all know it's never happening. Mother 3 is purely a meme.
  But off the top of my head I can't think of what other cult hits would be a big deal right now.

• Thinking in terms of what studios we haven't heard from in a while, HAL and Intelligent Systems. There's surely something Kirby and something Fire Emblem in the works, and those could be late Switch titles rather than Switch 2 titles.

• Third parties, I'm gonna stake my bet that we'll see Chrono Trigger. SE recently teased that they have multiple projects in the works, and CT remains conspicuously absent from Switch still. It's also not something they'd need to save for Switch 2. So tomorrow is the most logical time to reveal it.

• Silksong isn't real. It's a collective fever dream we all hallucinated. Sorry to be the bearer of bad news.