This is indeed the "day one" patch. There is no new patch coming today (unless there's a crazy hotfix issue.) We are working on 1.03, but that's not locking down until next week. We'd like to collect issues reported here and elsewhere to make sure any immediate stuff gets resolved.
Generally, that number at the end (508) is the daily build number. We don't fire off lots and lots of builds - it would take way too much time too do that. They usually only occur once daily, sometimes 2-3 times a day depending on the situation.
Ok well I fail to see the difference with this and the pre-release build. Can we get the patch notes or something? I thought the UI was getting an overhaul....