From what I gathered between playing in Blacksat and the DG panels last year, Greg Stolze is working on a set of short scenarios that act as both a Delta Green teaching aide and as background for Delta Green characters. So you'd run your group through Blacksat and a few other one-shots, scoop up the damaged, but still functional, survivors and have DG recruit them for your campaign.
As from the scenario itself, I thought it was pretty fun, and there's nothing quite as hilarious as Greg Stolze leaning over, flipping your character sheet over, and quietly saying "You're dead now," while the rest of the table is freaking out on what to do.