With the things like his hair and nails falling out, I kind of wonder if he's changing back to his original hairless/kitty faceless form. Like he was when the X-Men comics first started. But then again, he first got all the hair and stuff by messing up some sort of experiment, didn't he? So it's not really part of his mutation. Unless they just decided to pretend it is now. *shrugs*
Although I have to agree with you and hope that nothing too horrific has happened to him. Poor Beast.