Actually, all the alliances are doing the partial-involvement thing, they just haven't posted their memberlists yet. Probably because I was supposed to do that. One minute...
Edit: for now, it looks like the current lists are everyone who blitzed plus In Rage and yards from OP, Apocalypse T from Hellas, and PRION, Revention, Tempestus Solar and Parkway Dr. from RE.