2K Marin's Xcom has been hitting with a hefty delay and won't see the light of day until 2013. The game was tentatively set for release late in March, but given the deafening silence that has surrounded the game since E3 we can't say we're that surprised to see it pushed back.
Meanwhile, Firaxis' strategy title Xcom: Enemy Unknown is still being targeted for release this year so at least that's something.