That's warden armor? Looks like any of a number of DA2 leathers i saw. is that the entire picture or is it cropped for posting?
If it's not warden armor, I'd hazard a guess the guy in the pic is Cullen. They look similar and this could be a Varric retelling of Hawke's experiences (since the iconic Marion Hawke is shown), and we've already experienced playing with this particular Hawke (at the beginning of DA2 prior to CC opening up). Since people can look however Varric wants them to in his stories, Bioware can get away with the iconic (hoping if the Hawke is male, Marion is just a 'placeholder' and we can see a male Hawke--even iconic--in her spot). And Cullen is something both Hawke and the Inquisitor have in common.
It might be Carver, but again, that's iffy, assuming the Hawke was a mage, and that he was in the wardens AND it's the wrong coloring for that particular Hawke preset, but it may be a placeholder for any number of characters and this one is the one depicted in the screenies.
Eh, we may find out when the game is released. Not going to get all worked up with it for now. I know Steve Valentine has done some voice over work for Inquisition, so Alistair will be turning up if he's alive, but I'm thinking that's not Alistair for now.