No solid ETA on when the beta will go up tomorrow. So if you're thinking of calling in sick to work etc to get a jump on the game, don't. Go to work, run errands, clean house or whatever other pressing real life things you need to take care of. The beta will not grow stale and rot away if you download it a few hours later.
I've called off work waiting for a beta to be released before, only to have it not go live until like 8pm, wasting a perfectly good vacation day.
(No, I'm not saying it's going to be out at 8pm.)