Doing QA/polish on bringing the old DLCs forward to Escalation (gotta enable all the new units and such, then more or less rebalance everything), and man. The new defenses in Escalation in particular make some of those scenarios way more fun.
I mean, I liked 'em when I built them the first time. But I just had a great time with a rebalanced Against All Odds (you and an AI buddy have to defend against 4 enemies as well as automated attack waves, but you get to build both factions' defensive structures).
Which, of course, if I've learned anything from Ashes means that it's way too hard. So I nerfed it a bit before sending it back to QA, heh. Never let it be said that I am...ungenerous.