I think it was "in production" for a good, long while rather than being resurrected. There was controversy with season 3 where they didn't air a couple episodes that were critical of BET. That led to creative differences when they started on season 4, to the point where McGruder dropped out as showrunner. And I speculate that what they did was wrap up what was already in progress to produce season 4, which they're calling the final season. I'd be nice if these ratings prompt CN to reconsider that course.