I read the preview, spoilers ahead.....
Ill try to sum up as best I can...
Sam's daughter is killed in a car accident, Sam falls into really deep depression causing him to be removed from duty. Monthes later he asks for an assignment to put things behind him, he is given the assignment of going undercover and earning the trust of a terrorist and his faction, one problem. the target is in jail.
So the NSA has Sam "rob" banks, and in the final robbery there is a faked death to make him a murderer. Once in jail you must break the target and yourself out. In jail Sam wont have his usual tools, so darkness is no longer Sam's greatest weapon. In order to get past guards and escape, Sam must cause chaos via inmate riots. 😄
Once you escape you mst earn the trust of the terrorist faction, which leads to the new morality system(think KOTOR), when you escape you hijack a news helicopter, and to prove your loyalty, you are asked to execute the pilot, Double Agent will feature branching paths and multiple endings depending on how you handle these situations. 😄
Once in the group you must work to gain trust, therefore your missions have terrorists objectives, as well as the NSA objectives, only it isnt often that you can do both, you must choose.
Double Agent will feature the usual(though improved) multiplayer modes of the last 2 games. It isnt being made by Ubisoft Montreal this time, instead by Ubisoft Shanghai.
If anyone wants, I can scan the magazine as best I can.