Ok, here's the jist on Mark Hamill's project.
Hamill wrote a script called "The Black Pearl" between WC3 and 4 and was still revising it after WC4. The script, which was actually a suppose to be a movie, was repeatedly passed over since Hamill demanded to be in the director's chair for it. He pointed out on an interview with Z100 Radio (while he was touring to promote WC4) that "...everyone said that Meathead (Rob Reiner) couldn't do it... and he did!". Sadly, the script, last I heard, got passed over by New Line Cinema after a 2-3 month discussion about the pre-production and budget. NLC dropped the project and showed Hamill the door.
Hamill, I suspect, went to Microsoft and tried to sell it off as a game, though for some reason I want to say that he was selling the rights to the game so when he got the movie made, MS had the rights. I dunno, it doesn't sound right but something in the back of my head is telling me that.
The movie's plot was never really talked about but I rememeber it had an Indiana Jones feel from what little he said about it on the Z1000 interview.