I think Vinnie and crew all have enough other things going on (Paper + Plastick, families) that it makes sense to have someone else take care of the marketing and tour promotion at this stage of their career. The incremental cost (as they don't have an advance to repay) with guaranteed distro probably makes sense.
Just a guess, though!
That's also what I was thinking and is probably most likely the case. I'm sure Fat Wreck is letting them do whatever the hell they want anyway as far as the new album goes. (songs, artwork, pressings, ect)