Here is a preview of Spies vs Mercs multiplayer action in Splinter Cell Blacklist.

The same man who first brought SvM to Pandora Tomorrow is part of the team at Ubisoft Montreal responsible bringing it back in Blacklist.

There are two main modes:

CLASSIC SvM - 2v2; just like you remember it from Pandora Tomorrow and Chaos Theory
BLACKLIST SvM - 4v4; plenty of customization!

Either you're playing as a Spy (in 3rd person perspective); quick, agile, deadly in shadows; trying to remain undetected and hack terminals... or you're the Merc (in 1st person perspective); a brute force with unmatched weaponry who's trying to defend the data from the infiltrators.