My son called yesterday and they said it could take a week or two before they get all the assignments done - when they do, they will send an e-card explaining how to find out your assignment - just happy he got into res!
For those of you close enough to commute if you have to, I would imagine more rooms will open the first week of school if you can wait it out that long. Everyone else will have to start looking for off campus housing and will drop off the wait list so I'm guessing there's still hope.