The "naturemonevo" is looking likely to be a dipplin evo. The trailer seems to hint we'll be facing off against Kieran in the BB league, maybe as champion, and he has a dipplin in Teal Mask. Plus, Khu tweeted in a reply that he went and caught two new shiny applin for his shiny dex in prep for the DLC.
In addition to the number of new mons riddle, Khu also may have hinted at the number of forms:
6 + 1 + x for the twitterless. (That +x is what Khu wrote, nothing to do with Twitter's rebranding)
Notably, Teal Mask had 6... two of which it seems are going to be taken up by Sinistcha/Poltchageist unless it really happens to be standalone. Since we know Terapagos has a form, that would seem to use up the only slot for Indigo Disk, which would mean that if Blood/Harvest moon Ursaluna is a form it would be in Teal Mask. That leaves only 3 slots. If Ogrepon has a form, then it would seem to preclude the loyal three getting any forms because only 2 slots would be left, so potentially Ogrepon gets multiple forms. If Poltchageist is standalone, then it looks like there's enough room for Ogrepon + the loyal three to each get a form. Or, since the balloon mini-game had 4 types of Ogre, maybe Ogrepon just gets 4 forms...
To summarize:
If Sinistcha exists, the Teal Mask forms would seem to be:
-Sinistcha
-Poltchageist
-Ursaluna
-Ogrepon x 3
If Poltchageist is standalone, then we could have
-Poltchageist
-Ursaluna
-Ogrepon
-Loyal 3
or
-Poltchageist
-Ursaluna
-Ogrepon x 4
Excuse the double-post, but I figure an edit to the quoted post might go unnoticed:
Somehow I totally blanked on the fact that the base forms are not included in the form count, so one of Ogrepon's forms would just be its base form and the other 3 are part of the count if the balloon theory holds. This would make room again for a Poltchageist evo, which it seems people are speculating about because the gift box that the PokeTubers got included Poltchageist's vase and spoon, as well as another dish and matcha stirrer. I guess TPCi deciding to name fake-Sinistea after Polteageist and a new evo something entirely different is possible, though a bit unprecedented.
Crackpot theory time: in the key art for the Teal Mask there are a bunch of lanterns with type symbols on them, which have been speculated to be hints at the types of the loyal three and Ogrepon:
Khu highlighted the lanterns recently, too. Given that the loyal three have Toxic chain as an ability, they likely share Poison. The most recents presents had a scene in which Munkidori used a psychic move, Fezandipiti used Moonblast, and Okidogi used something like Giga Impact but could possibly be an updated Meteor Assault, which could hint at Psychic, Fairy, and Fighting types for those three. Then, we've also seen that the balloons in the ogre busting minigame have grass, fire, water, and rock symbols on them.
This accounts for all of the symbols except ghost and the ogre symbol. Possibly then Ogrepon could be part ghost, which if it were dual-type in all its forms would make it the first rock/ghost, third water/ghost, and seventh grass/ghost and fire/ghost lines. :P (But, if its mask changes its type, then possibly it acts more like terastallization and becomes mono-type depending on which mask it wears).
Presumably the ogre symbol is just representative of the ogre story, but I guess there's an outside chance it's the 20th tera type. (Though it'd be weird if part 1's special tera type were revealed before part 2's, so I wouldn't bet on this).
