The next Splinter Cell title revealed with scans. The game is titled Splinter Cell: Conviction.
They say that at the beginning of the game Sam learns that Anna Grimsdottir is in danger so Sam joins Third Echelon again in order to help. However Third Echelon is not what it used to be and in the first mission Sam gets false info and the wrong equipment, while his bosses are bickering amongst themselves about procedures, authority and such. Then Sam finds out that the threat to Anna comes from within the Third Echelon, quits and becomes a fugitive.