Just found out about CS:2
And from the looks of it, It hasn't come out yet
(correct me on that if I'm wrong)
If it isn't out, they should re-add the Spetsnaz, and maybe add a Mexican marine team, that would be cool to see, (even though mexico has drug cartels and not terrorists)
Other teams could be:
CIA Special Actions
Delta Force
KSK (as a team for multiplayer)
If you have any other unit suggestions, comment it