There was a reunion show last week... (it wasn't that great) The new host(ess) was on it. I hear that Caroline's contract wasn't renewed. It might have had something to do with her image and weight gain..
The new hostess is Allison Sweeney. I think she starred for many years on Days of Our Lives.. I don't think she did that hot last week. Namely they had a hokie theme that they were trying to evoke on the returning contestants.. It sounded like an infomercial.. (the chant was "Did they keep the weight off"

(and then they were sent to the scales.) I think mostly Allison was nervous and embarking on something totally new... she may well work out great.. just her debut was a bit rough.. Probably a bunch of factors contributing to it.. (bad format and a newbie!)
I'm really looking forward to it too..
I visit the NBC forums for the show too.
They showed some clips of the new series.. and there is another twist in it.. Some of the contestants are supposedly sent home but actually go to the trainer that left the show.. Kim replaced her.. (Can't think of her name at the moment..) So there in essence might be 3 coaches and 3 teams..
I'll be watching.. or plan to!