Yeah, I figure we'll get a Faker out of them, and maybe Man-at-Arms, Mer-Man, etc. I don't see them giving us Beast-Man, Trap-Jaw, or any of the others with legs that aren't either He-Man's or Skeletor's, unless they say "good enough" and use one of those.
Really, if they would make a 'bare' lower leg and a 4-toed 'claw' lower leg, they could make all of the figures except odd-balls like Mekanek or Extendar. Figures like T-J, Roboto, or Man-E-Faces, they could use the bare or He-Man legs, with some leg armor from Halo or CoD figures. Teela and Evil-Lynn are the only two I really don't see them doing, unless there is enough demand for a full line. Luckily, I have a couple spare Cortana figures to mod into Teela and E-L if I really want them. Evil Horde and Snake Men would probably need to borrow parts from some of the other lines they've made. Some of the other lines already have good parts for MOTU characters. For example, I made a "good enough for me" Whiplash from some TMNT and Destiny parts, along with some thin wire and Plasti-Dip:
As long as I can find enough He-Mans and Skeletors, along with some parts from their other lines, I can make any figure I want now.
Edit: Or what Redmao said. He said what I was saying with a lot fewer words.