I think the weigh in during the preview was yellow vs. blue and therefore not the actual weigh in.
We know that it is either Gren, Purple, white or brown that goes home. In the preview, the room they showed during the emergency shot - was white. Not sure if they just picked it b/c it is neutral or b/c it was him. It was definitely a guy. The thing that confuses me is that they said "he has no previous history and is conscious" This made me think it wasn't Mice. I can't imagine they would say no previous history about him!!
Bob was on Jay Leno last night and they talked about Mike and Bob said - "He is doing AMAZING."