I noticed the same change in 'this year's' Nutrisystem ads. I think it is a different person too - copied most of the mannerisms but not all of them. The hand gestures around are quite different. Could be MO's voiceover though. The voice/mouth coordination does not seem accurate.

Edit: just watched the new commercial again. Nowhere does it claim that this is Marie Osmond, and they never showed her 'before' photo like they have in the past. This is Nutrisystem using up the goodwill from MO's tenure. She probably asked for too much money to continue. (or regained the weight she lost)

I noticed the same change in 'this year's' Nutrisystem ads. I think it is a different person too - copied most of the mannerisms but not all of them. The hand gestures around are quite different. Could be MO's voiceover though. The voice/mouth coordination does not seem accurate.