The idea is still the same, you have to do objectives, try to not make too much attention etc. just like in the old games. You can switch between your characters while playing(green beret, spy and sniper), each got their own special skills and tools.
Check the trailer & screenshots out: http://www.eidos.co.uk/gss/strikeforce/main.html
You can also download a demo with 2 missions and it's really awesome. I really recommend you to have a look on this one.

