Beyoncé will indeed appear on Kanye West and Jay‑Z's new album 'Watch The Throne'.
'Him indoors', Jay‑Z, has just posted the tracklisting on his blog confirming Beyoncé's vocals on 'Lift Off'.
Contrary to earlier reports, Bruno Mars will not be joining Beyoncé on the song, but according to producer Jeff Bhasker, it doesn't really matter. On May 1 he tweeted "I don't know who will end up on Lift Off. I do know it's dope as fuck."
Despite Bruno's absence, 'Watch The Throne' will not be lacking in pop/R&B vocalists, with Mr Hudson appearing on the album's closing track 'Why I Love You'. Thank goodness for that.