The Launcher "and its related tools" have gotten another upgrade today, even though the realms haven't come up yet, which tells us that the Background Downloader probably has more work to do, which itself means that we probably won't see 3.0.2 today. Not really a surprise -- it's early by anyone's predictions for sure -- but the Downloader has had a full patch out for a while, so the update is primed and almost ready.
Today's downtime is all about hardware upgrades, apparently, so Blizzard is definitely gearing up for Wrath. We saw lots of hardware upgrades in the months before the Burning Crusade launch (people who were playing back then will remember all of the horrible queues and population issues before servers got expanded), and while Wrath probably won't be as big a jump, Blizzard is still getting ready.
Which just leaves the question of when we'll see patch 3.0.2. Considering the BC content patch came just about a month before release, we're still looking for it in mid-October (likely after all the ruckus of BlizzCon has died down).