This excerpt taken from the ATVI 10-Q filed Nov 10, 2008.
19. Subsequent event
On November 5, 2008, we announced that our Board of Directors authorized a stock repurchase program under which we may repurchase up to $1 billion of our common stock. Under this program, we may repurchase our common stock from time to time on the open market or in private transactions, including structured or accelerated transactions. We will determine the timing and amount of repurchases based on our evaluation of market conditions and other factors. The repurchase program may be suspended or discontinued by the Company at any time.