OTBOA will get a video, but I assume that it's still in the editing process, and we'll probably get it around the end of September or so... I don't think that it'll be used pre-release promotion since the song itself fulfiled this purpose already.
From what I've seen, the second single is usually released a few weeks/months after the album has been released. So if, say, BMUBMD is the new single, it's going to take at least several weeks until it's released separately. Chances are, though, that the second single will also get a video, since that has always been the case since DT signed under RR.