QUOTE
We also asked him a bit more about the much-touted co-op mode. You can play the entire story-based campaign co-op either in split-screen or via Xbox Live. A great feature of the co-op mode is that you can jump in at any time, so even if your bud comes over to your house when you're in the middle of a game, he can jump in as Dominique and start blasting away with you. It won't just be a "Dominique magically appears" scenario, either. Even if you're playing the game alone as Marcus, Dom will be tailing you -- and fighting with you -- the entire way, so it's just a matter of your friend coming in and taking over as Dom.
No system link coop.
That would suck much. I hope this is not the trend of all x360 games; live coop and split screen coop, but no sys-link coop.