[SloopSloop]

Suprised I haven't seen this mentioned here, but this seems like the place. There was a post on the "Kamen Rider News" Facebook page (that went largely ignored) translated from the catalogue scans with Maximum Gamer and whatnot, that stated the forms for the third, DVD exclusive part of this as well.

Spoilers of course, but the forms are a Taiko No Tatsujin form for Ex-Aid, and a Ganbarizing form for Genmu! The same post mentioned Genmu using Wizard Gamer before this trailer came out, so I'm pretty sure it's accurate, though it makes you wonder why the Ganbarizing Gashat was absent from the catalogue.

There was also a picture in the recent TV Kun scans showing what appeared to be Legend Rider Gashats for Kuuga through Fourze. I don't really care to go find either of these sources right now, but if you want to look them up I assure you they're there.