Internal GameStop documents regarding future game releases have just been uploaded on the internet. As you can see below, God of War 3 will not be releasing until March, 2010, and Uncharted 2 will be hitting stores shelves October 1st.
Some other notable titles and their release dates are :
God of War 3: 3-10-2010
Uncharted 2: Among Thieves 10/1/2009
Bioshock 2 10-5-09
Tekken 6 10-27-09