Interviews went out yesterday with a deadline to accept of just two days. I expect that's so anyone that pulls out can be replaced in a second wave, but given the nature of Gates I don't imagine there would be many. Because the deadline is so short and there's only a few weeks before the interview, I don't see them doing rolling admissions otherwise, but of course they might.
If anyone found any useful resources to prep for the interview, do let me know!