Yes his name is Four, and he's the (much aged-up) love interest from Veronica Roth's Divergent series. Others will remember him as the guy who died on top of Lady Mary mid-coitus in Downton Abbey.
Thanks to Entertainment Weekly, we now have our first look at Four, played by Theo James. Set in the future world of Chicago, Divergent is centered around one girl who tries to find her place among the various "factions" the city has been divided into. When she's selected into the warrior cult, Four becomes her trainer. And sexy sex sparks fly, along with a lot of blood.
For a high-res look at Four, head over to EW.