Windows 7 may be Released to Manufacturing, but that doesn't mean it's done. Nope. When you're Microsoft and have many companies to work with, you need to make sure they're ready too, lest you want Vista Launch 2.0.
The two major things left to do before Windows 7 launches are language packs, since Windows can't launch in any country without all countries being localized for. And OEM builds, which allow manufacturers to test Windows 7 against their machines and make sure they've got a working version of Windows ready to ship that works out of the box.
But, if you're one of those English-speaking people that's been using Windows 7 beta and Windows 7 RC without a problem, chances are you can probably use Windows 7 final now and be just fine. So for you, it's pretty much as done as it's gonna get. [Windows Team Blog]