I did. Like Avalanche, I just haven't finished it yet. I got caught up in porting Rogue to MUA because she is t3h hawtness. I'll finish Mystique this weekend, as well as try to figure out why Avalanche crashes my game, and nobody else's. Once I figure that out, I'll finish working on him and have Avalanche done too.
EDIT: As a side note, I didn't realize I released the "classic" skin for Pyslocke. I never intended to do so, and forgot to take it out of the folder when I uploaded the update for Psylocke. Reason being is that I was not finished with it, and her face still looks like crap. I'll fix that soon, and upload the updated skin. I'm also going to work on Polaris so she is a unique character, and isn't just a cloned Magneto with giant breasts. Any complaints about Emma yet? If not, I believe she is done (well, I'm going to make a new icon set for her, as the one I did was half-assed and a quick fix so there was something to look at).