the letter says that they mail interview invites through the month of march though, right? i think they mean they will re-review your application at the end of january...
yea i got one of those too, but i haven't done anything. i did my academic update for summer and fall, i got A's in all 3 courses... other than submitting that info, i didn't do anything. i don't like to bother the admissions office if i don't have to cuz i know they are busy people, but perhaps that is my downfall...