Part of me is kind of hoping that FemTitan isn't Annie; but I don't think that's really the case, since: 1. It looks like her, 2. She's easily unaccounted for, and 3. I think every other single female HAS been accounted for.
That having been said, since Eren and Annie book retain certain resemblances of their human form when Titans, it's not very difficult to figure out that Reiner guy is probably The Armored Titan (buff blonde buzzcuts and all that jazz).
Haven't quite figured out who/if Colossal Titan is somewhere. I'm sort of leaning towards Irvin, though watching the credits there's some dark-haired dude staring at a wall with Annie and Reiner. I don't know who that guy is, or why he should matter, but he's in the credits! So I guess that means something?