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I just did a drain & fill yesterday. Picked up a new filter/gasket and refilled with Dexron VI which is now available from GM. Decided not to "power flush" , old fluid nice and pink. I was only able to put about 4 quarts of new fluid in.
Here's some good info... http://idavette.net/hib/C5diy/c5diy2.htm
I believe it is about 4 quarts if you drain the fuild and refill.
It is about 5.5 quarts if you do a 'power flush' or a completely empty transmission. You will only be able to add about 4 quarts at first, but once you start the car and allow the transmission to move the fluid through it, you will need to add about another 1.5 quarts.