Rock band The Replacements is to have several of its albums remastered and re-released in the US this summer. NME claim the albums will feature 'some previously unreleased gems, such as a Tom Waits collaboration called Date To Church'.
Depends on how you define 'unreleased', I guess: Date to church with the Waits vocal contribution has been available on the Replacement's 1989 single I'll Be You, on the 1989 compilation album Just Say Mao (Vol. 3 of Just Say Yes- various artists) and on the Replacements 1997 own compilation album All For Nothing, Nothing For All.
More info such as track listings over at Rhino Records.