It's mid June. As I recall, Albore didn't pick Lieberman until sometime in the middle of summer, say late July/early August. If Kerry's supremely desperate to get noticed, he'd do this now, but he'd have nothing to build on going into the convention.
I don't think he'll do it, but nothing Kerry does surprises me anymore.
Gore named Lieberman on August 8th. One week before the convention.
I think that's the converse.................when John F'n "flip-flop" Kerry does SOMETHING (apart from ride his bike in circles) THEN it's a surprise.