I got an email. Subject line: MI Offer of Admission. Don't give up hope yet, though...I did have a pretty short turnaround time between submitting my application and getting my offer. (Two weeks!) I'm hoping this means they think I'm a strong candidate and will give me lots and lots of funding, but I've got no idea. The MI program might have different requirements or even a different committee than the PhD program, though, so my experience probably isn't relevant to yours. I hope you'll hear back soon.
I submitted it late at night on the 12th of February. My referees got their letters in the week before. My application's still marked as under review, and I still haven't heard the "official offer" from the SGS.
FWIW, on my other application (U of Illinois), one of my referees also got her letter in at the last minute. I still heard back from that school earlier than expected. Don't panic about whether or not your referees got the letters in late-it doesn't matter as much as your personal qualifications.