Today, starting at 9:02AM, Apple shut down a few services until 12:57 PM.
Apple has not released a statement as to why this has happened, or as to what has caused it. We are only left to speculate. Although it could be possible apple was just performing server maintenance, I think it might have something to do with the fact Apple is updating services to keep what shutdown the Developer Portal from happening again.
When Apple releases a statement, we will let you know.
EDIT: At 11:34 FaceTime services were down until 4:30. Apple still has not released a statement.