Princeton's Gilbert Harman makes a very persuasive case that the answer is probably 'yes!' [Thanks to Kristopher Philips via facebook.] You may remember Hauser...he is the guy that fabricated data. I assume that the reason for the delay in going public with this (Hauser's book got published in 2006) is to wait until Mikhail's book got published.
UPDATE (9/26/11): Professor Harman has clarified the intent of his piece in a comment added to the thread below. The "plagiarism" charge was meant for private discussion only, and was not intended for public consumption. His piece has now been removed from the web.