Here are the details as I've been able to ascertain them:
1. The prize fund will be $15 million, with 2/3 going to the winner and a 1/3 to the loser.
2. The match will have 12 games with a time control of 90' + 10", and is scheduled to occur in May of 2007 in the Philippines.
3. Karpov has signed the contract; his expected opponent has not.
In my view, the only really significant detail thus far is the second part of the third detail, so don't get your hopes up yet - assuming you have any interest in seeing the match take place. As I'm not interested in Gothic chess and have an interest in not seeing Karpov's opponent broadcasting his anti-American and anti-Jewish views, I'd just as soon the match never happens.
For that matter, why would a game publisher want Fischer to represent his company in public? Is the guy just a dope?
I couldn't really care less what he or Karpov play in a chess variant under dinky time controls.