While we are waiting for the real thing, you might want to check out some of these Tom Waits tributes:
Small Change Band and Two dollar pistol feat. Ryan Fitzsimmons & Danielle Miraglia will be performing Tom Waits covers at Johnny D's (Sommerville, MA, USA - April 18th)
Peter Mulvey & the Crumbling Beauties and Babes in Boinkland perform a tribute to the Rain Dogs album at the Oberon (Cambridge, MA, USA - May 8-9th)
Leon Tol and his band William the Pleaser will be performing at De Harmonie (Edam, The Netherlands - May 16th)
Bright Phoebus sings Tom Waits at the Shrewsbury Folk Festival (Shrewsbury, UK - August 25th)
DISCLAIMER: I have no idea how good/bad these are. Attend at your own risk.