I can ask the same question. I have was accorded Premier (which I greatly appreciate) early last year, and my MRIinsider icon has not changed. However, I have no problem with that -- I just appreciate the Premier status.
Yeah, same here... and actually it shows up as Plat for emails from Marriott.com as well, weird but as long as I still have the Plat. Prem. when I check into the properties when it counts most :) I guess it all works out.