I've beaten SR2 in single and co-op, but not once have I bothered to try the multiplayer stuff outside the main game. I'm up for it if we get a GFF crew together.

This blog entry sheds some more light on what the new package has to offer.
One of the co-op missions plays very similarly to Heli Assault... except that one player flies the whirlybird, and the other drives the vehicle in need of top cover.
Aside from the bandanas, the Ronin jacket made the cut... and yes, it's customizable (why the SWAT gear in pack one isn't customizable is a decision I do not understand to this day, however).

We got here a full list of what's to be in the second DLC pack coming on thursday. I was already sold due to the continuation of the goings on with Dex and Ultor, but the new vehicles and clothing are pretty sweet.

Not that I wanted a Ronin Jacket, but the face bandanas should've been a given from day fucking one.