Honestly, I think there's a good chance that Woo Hoo isn't even going to be on the album, let alone be released as a single.
Reasons for it:
- Ke$ha herself has said that all leaked stuff so far are old songs. Why would she lie when she could simply choose to not comment this at all if Woo Hoo was actually supposed to be on the album?
- Somebody over at ONTD, who apparently has a friend who possesses demo CDs that Ke$ha used to pass on to club DJs pre-success, says that he/she remembers to have heard the song on one of those demo CDs from a looong time ago. Even though he/she isn't 100% sure it was the same song, I'm inclined to believe it.
Maybe that's ******** and the song is new, but maybe we're getting excited over nothing. Let's not read TOO much into this and just continue waiting for a full HQ leak.