If you are a subscription customer and have access to download software and updates from the site then you should find Revit Architecture 2011 is now available for download. Good luck though, the subscription site is down at the moment offering a nice message that it is temporarily unavailable. Something about +2gb downloads simultaneously?
Added: You may not be able to authorize the software until you get product serial number and product code in the email from Autodesk. You'll have a 30 day window to get it authorized so hopefully the licensing information will be forthcoming reasonably quickly.