According to this EA press release, both stars will "take on the role of cutthroat executives working for the biggest and most aggressive syndicate, EuroCorp, in a near-future world ruled by three mega-corporations".

The in-game characters of Brian Cox and Rosario Dawson.
This is what Dawson had to say about her new role:
"I was excited when EA approached me to play Lily Drawl in Syndicate. She's an interesting and strong female character. How cool is it to play the mastermind who designed the military chip inside the player's head!"Both Dawson and Cox will be joined by fellow actor Michael Wincott, who you might remember as the bad guy from The Crow.
Syndicate is due for release on February 21.