A must-have extra: a video produced about the "lost" 5th season they planned.
I'll second that!
With Doug Drexler's NX-01 refit in motion... and lots of CG work to illustrate all the "What If" scenarios.
I'd imagine they'll be a roundtable discussion of some sort. Either a cast reunion (preferred), or a bunch of uber fans complaining how it wasn't how they imagined a prequel to be (not so much)!