Apple Developer Center front page is still up while member center has been under maintenance since late Thursday July 19, 2013.
The message says:
We’ll be back soon.
We apologize that maintenance is taking longer than expected.
If your program membership was set to expire during this period, it has been extended and your app will remain on the App Store. If you have any other concerns about your account, please contact us.
Thank you for your patience.
John Gruber thinks that it is bad news since Apple Store was also down.
Obviously his spidey sense is either off or he doesn’t have one at all; John Gruber is not Peter Parker. Apple Store went back online right after Midnight on Sunday July 21, 2013.
During this period, Apple ID site is still working without interruptions.
Apple is expected to release iOS 7 beta 4 and OS X Mavericks Developer Preview 4 on Monday July 22, 2013; based on two week release schedule. Apparently many sites are reporting the obvious as news.
At this point our Apple contacts are either saying nothing or unreachable (out of the country).