There's more that needs to be changed, or updated. The canned death animations and lack of hit response isn't a critical issue, but it works better in MP than SP. It would be nice if they eased up just a bit on the scripted enemy "tactics" and actually tried something a bit more dynamic. And drop the theme park ride stuff and let me take more direct part in the cooler sections, like rappelling, kicking down doors and dealing with field prisoners.
The MP can be a COD4 clone with new weapons for all I care, I'm fine with that. Maybe real clan support and optional larger games, but it's
so good the way it is.
As for the trailer, sounds like a terrorist attack/siege.

Call of Rainbow Six: Modern Tactics

Edit: I'd totally buy an arcade style COD for Wii, though. Hell, make it a rail shooter.