Apple has taken the site down for the moment and has decided to overhaul the developer system, update the server software and rebuild the database. Since the site was removed on Thursday, Apple says that it has been working around the clock to get the site back up. No date was given as to when developers should expect to see things return to normal.
Apple did say that it has extended the membership period for those whose membership would have expired while the site was down, and those members' apps will remain on the Apple App Store.
source: Apple via AppleInsider