OK... Some observatons after listening a few times...
The very beginning sounds like they simply sampled the original drum intro to "Do it Again." From the time that Mike's vocal begins, up until around thirty seconds, we can hear the drummer of the 2011 version hitting his bass drum and tom in the left channel on the three beat, then he comes in with the buildup and the sampled drums go away for the rest of the song.
Maybe it's a Watermark?
Anyway, I haven't spoken about the re-union yet, so let me just give one comment...
BRIAN'S VOICE IS BACK. And I think we might see a new falsetto lead from him? I hope so!
Remember "Your Imagination"? that was a pretty well charting song (not that that matters) and It used Brian's Falsetto back when it was still "meh"