He said on Friday that they were shooting for Thursday for the update. We haven't heard anything else since then, so they may or may not be on track for that. It won't be today, though. They're almost certainly not ahead of schedule, and I suspect the reason they are shooting for tomorrow is because the Android Droid event will be over by then, and they can remove that while updating the other stuff and not have to do two updates.
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People are saying tomorrow, but I think that's only based on past updates. Not sure if it was confirmed somewhere.
I believe the patch notes will be posted later today but don't hold my words for it.