no one is saying for sure. I have doubts we would ever hear about it, since the person or people who get it would probably be dead in a day if it was known.
This article has information on it:
http://www.npr.org/blogs/thetwo-way/2011/05/03/135929518/who-gets-the-27-million-reward-offered-for-bin-ladens-captureFrom the article: At a news briefing, Secretary of State Hillary Clinton was circumspect about the case. "Given the importance of confidentiality to the Rewards for Justice program, I cannot comment at all on whether anyone has been nominated for a reward in this or any other case," she told reporters.
snip
Intelligence officials say that key tips on the bin Laden courier network came from detainees, some of whom were exposed to enhanced interrogation tactics. Not exactly the people U.S. investigators would choose to get a huge payday.