Are you on lawschoolnumbers.com? You should check out that website if you aren't.
I got WL @ UMKC for Fall 2009, too. Honestly, I've been trying to figure out the answer to your question myself and have no clue. When I research online, chances don't look good. However, I work with a UMKC 3L and he said quite a few people got in off the WL for his entering class. Of course, there's no telling how many people didn't get in, though.
All in all, I'd say don't hold your breath. Accept admission some where else and if UMKC comes through for you go there. You'll have to forfeit your seat deposit to the other school, but if you really want UMKC then it's worth it. That's what I'm doing.