The iconic asymmetrical multiplayer mode Spies vs. Mercs will return to the Splinter Cell series in Splinter Cell: Blacklist. From the announcement trailer, we can surmise that spies are still dead-set on hacking those terminals, while the mercenaries still have an insatiable bloodlust for sneaky dudes wearing tights.
Light and shadow seem to remain prominent tools in Splinter Cell: Blacklist's Spies vs. Mercs mode. The mercenary flashlight and motion tracker are both featured, and there's one sequence where we even see a mercenary employ an explodable drone to take out a spy lurking in the dark. Another sequence shows four spies decloaking, so presumably both sides have some new abilities in Splinter Cell: Blacklist's take on Spies vs. Mercs and the mode is no longer limited to two-on-two.