Cataclysm Digital Download

One of the things I was pleased to hear from Blizzcon 2010 is that the Cataclysm will be available via digital download from day 1.  I had some initial concerns that the direct download might be delayed until the morning of the day of the release similar to Starcraft 2.  You had to wait until 10 am for that one.  Fortunately everyone can get cataclysm at the same time, 12:00 AM PST (or for me 3:00 AM EST).  That's a bit late for us east coasters but I guess you can't please everyone.  I wonder how bad the servers will be since so many players will be able to do a midnight release without having to find a store that does it.