Apple has confirmed that they are investigating a security breach in their App Developer center.  Site remains down while company overhauls security. Tech Crunch spoke with an Apple rep over the phone and reports:

Update — Just got off the phone with an Apple rep, who confirmed a bit more:
  • The hack only affected developer accounts; standard iTunes accounts were not compromised
  • Credit card data was not compromised
  • They waited three days to alert developers because they were trying to figure out exactly what data was exposed
  • There is no time table yet for when the Dev Center will return

Here is a screenshot of the message on their website. apple app dev center hacked