Haven't heard back from Berkeley and Stanford yet, but was interviewed a few weeks ago.
Also, I highly doubt that MIT rejects on account of GPA. Can't reveal much about myself but I do have a 4.0 GPA from well-known prestigious undergrad as well as quite solid research experience but was still rejected. I guess what really matters is your research fit (and thus my rejection).
My previous work was on a slightly different side of OR from what they do at ORC. But whatever, I have other offers and will probably (and hopefully) have a better fit somewhere else.
Yes. I got into Cornell and GaTech at least couple weeks ago. Didn't apply to Michigan and Purdue.