New Deniable Ops map now available. Go to GameSpot.com/SplinterCell for your unique code.
It is for US and UK only and while supplies last. You have to have a membership on their site and a code pops up (and emailed to you as well) instantly. Completely free and only takes a minute or so to get.
The map is 3rd Echelon and is available in "Hunter" for COOP and single player. I noticed it under "Last Stand" too but that might have already been there.
Hope this helps.