We're heading into Shooter Season, which is going to be huge for the 360. Already ramping up with BL2, but obviously that's just the tip of the iceberg. I think the 360 will make up around 800k on the PS3 before the year is out. Halo will move a lot of consoles to people who already have 360 consoles, as well.
That's just the way it goes, though. The PS3 sells steady for the year, while 360 sales come in huge spikes at the end of the year. This correlates with the 360 having a younger and more shooter-centric user-base.








