I’m honestly half and half, but since gen 10 being revealed isn’t very popular, let me be devil’s advocate:
This Presents is getting an enormous amount of unusual hype. It was announced extremely early in advance, has an entire pre-show dedicated to it, and comes in the middle of an insanely dry period for news.
Most notably, its date is a reverse of Pokémon Day’s: instead of being on 2/27, it’s on 7/22, which I think has some significance given Gamefreak’s schizophrenic bending of the rules lately. They’re trying really hard to be subversive towards their traditions, so I can absolutely see them mostly focusing on Z-A and then dropping a Scarlet/Violet-tier teaser for gen 10.
Basically, I think things will play out as follows:
>Tomorrow’s Presents is mostly focused on Mobileslop with one big push for Z-A. This push for Z-A will kick off multiple months of smaller marketing reveals up until release.
>The Presents will end with some cryptic or very small reveal of gen 10, probably not going any further than starters + titles.
>This reveal will be followed up on next Pokémon Day, where there will be a whole official reveal trailer and lots of attention given to both gen 10 and the 30th anniversary,
>which will be heavily focused on through constant news updates until gen 10 releases.
I think this clicks most with what Gamefreak is going for. Hyping up this specific Presents so much just for Z-A makes little sense, so I think they’re trying to recapture normie attention spans for a long time yet. They’re going to draw them in with Z-A news and hook them in with gen 10, then keep feeding that goldfish memory with hit after hit regarding the brand so that they have a constant spotlight during the 30th anniversary and boost advertising + revenue during what will probably be a very profitable period.
TL;DR: I think they’ll be secretive about gen 10 until 2/27/26, but reveal it at this Presents to try and keep people interested in the brand.