Doesn't Drive regularly have this sort of hiatus? They treat it like a TV show with seasons, rather than attempting to pump out stuff year round. The NBC stuff is just filling what would usually be an empty void.
Anyway they've said in the youtube comments that Chris has already done a bunch of videos, JF has been filming in a couple of different countries, and Musto and Matt have recently returned from vacation and will be filming stuff soon. I expect it shouldn't be too long before they have a decent enough weekly schedule for them to start releasing stuff.