Cool writeup on Perfect Dark Zero for the X-box. The initial screens looked terrible, but there was the requisite "its just running at 25%" statements, so we'll see. Anyway, some of these features look good:
http://forum.teamxbox.com/showthread.php?t=351281
Highlights:
-They will have co-op over xbox live, maybe with four players. Also, the counter op mode is back, allowing you to play through the campaign while your buddies play the bad guys.
-The motorcycle can have a driver and a gunner on the back. There's a hovercraft that can seat as many people that can fit on it. They can all shoot but one person can man "a very powerful gun on the back."
-The levels are huge as we know, about 12 times as big as "sidewinder" from halo 1. You can also lay down "waypoint markers" for your teammates to see.
-The cover system sounds cool, and reminds me of the gears of war deal. You press A to take cover, then you see your reticle. Aim it where you want, and when you press the R trigger, you pop up in first person perspective and shoot. Release R to return to cover.