I haven't picked up my copy yet, but from the writers listed, I have it pegged as the Steve Orlando story.
I think he'd be one of the better choices to take over when Rucka leaves. His runs on Supergirl and Apollo/Midnighter, and now (possibly) this show he's isn't afraid to mine the obscure stuff.
EDIT: Just looked at a review of the annual, and it is indeed Orlando.