HOLY SHITT :|!!! Where the hell did you find this? Did you crop out a high res screen shot and zoom in? Jesus NR must have been laughing for so long that we never figured this out.
So it is Skarlett guys, congrats we have a new character!!!
EDIT: Its from the Gamespot screenshots that were released just now. I guess we were all caught up with Stryker that we did not see this in the background. Wow we are idiots .