Well yesterday this was posted on their Twitter:
Really? Where did you hear that? As far as I know, nothing's confirmed yet. RCA planned the leak as an attempt to 1. stop all the negativity coming off comparisons with other artists and 2. give the public something to chew on in the mean time before the album drops. They're still testing the waters so we'll have to wait and see.
'WOOHOO'!!! Have you heard #christina's next single off of 'Bionic'? 'WooHoo' features @NICKIMINAJ, check it out @ 4 minutes ago via TweetDeck
But Sony retracted that in a later tweet. Wack. =\