As of 3pm today Autodesk officially released and announced that the new versions were available for download. Some were able to download it a bit earlier than intended by "reverse engineering" the web address for 2008 versions. While it technically worked I refrained because I wanted to hear it from the "horse's mouth" that it was released, on the off chance that a final build hadn't been posted yet.
So the good news is that for those with adequate broadband access you can download the version you use anytime you want now.
Here are the links to each version:
Revit Architecture 2009
Revit Structure 2009
Revit MEP 2009
Note: Only the English version is available for download at this time as they are preparing the other language version now.
Also take care to download the correct version if you own the "suite" that includes AutoCAD or AutoCAD MEP. As Greg noted in his blog this morning you won't be able to authorize AutoCAD properly because the "suite" version is not posted at the Autodesk site for download.