The rappers appear on 'Again', a track set for release to US radio...
The remix features Andre 3000 on backing vocals, with fellow Outkast man Big Boi contributing a rap.
There are no plans to record a video or give the song a commercial release, according to mtv.com.
The duo return to the UK in June. The dates in full are as follows:
Levi’s showcase London venue (tbc) (June 7)
Gatecrasher Main Stage (16)
London Astoria (20)
Creamfields, Dublin (23)
Milton Keynes Bowl (as support to Limp Bizkit) (24)