Any release date for GHC 6.8.3 for Mac OS X 10.5 (Leopard) on PowerPC G4 machines?

Is there any scheduled release date for GHC 6.8.3 for Mac OS X 10.5 (Leopard) on PowerPC G4 machines? I have a G4 PowerBook, currently running Mac OS X 10.2.8 (Jaguar), which I plan to upgrade next week. I also have the upgrade discs for both Mac OS X 10.4 (Tiger) and Mac OS X 10.5 (Leopard). Backing up my hard disk before upgrading takes about 20 hours; it seems a pity to upgrade to Tiger before eventually upgrading to Leopard (unless GHC is never going to be released for Tiger on PowerPC G4 machines, which would be much worse). -- Benjamin L. Russell