Who will Joe Biden endorse for President?

Biden was my man, but who will he support now that he's dropped out of the race? He hasn't indicated anyone as far as I can find? Any predicions?

Public Comments

1. I believe he will endorse Clinton.
2. He shall wait till it becomes clear whether it is Hillary or Obama who gets the nomination.
3. I don't know for sure who he will be endorsing, but I predict it WON'T be Edwards.
4. He said he will not support any other candidate. It seems most Biden supporters are going towards Obama, but there is no official statement.