Michael McWhertor of Polygon just tweeted: No trial happening in West v. Activision suit. No comment from lawyers yet but case has been resolved. Updated: http://www.theverge.com/gaming/2012/5/31/3049988/activision-call-of-duty-trial-placeholder
Again, I'm not giving you my opinion. I'm directly quoting from a legal brief, filed by the Infinity Ward CCO and CTO. I didn't work on the game, and so I have no idea what pressures the team was under. For what it's worth, the wikipedia entry for the game says they developed a new iteration of the engine for MW2, "which…