My code still isn't working either. It stopped working around the time MK was banned in Australia. I'm not sure if that has anything to do with it, but I'm in the US. I wrote GameStop near the end of February and got some generic responses (typical). Then on March 2nd, I was told my request would be sent to their Premiums department for review and processing. I still haven't heard back from them. So I e-mailed them again today. Round 2...
GameStop really dropped the ball on this. I can survive another 24 days until the game is released before seeing these uncensored fatalities for myself, but you shouldn't promise something to people if you can't deliver it.