It is nothing new that games use the likenesses of more or less well known actors and as it turns out this will also be the case in Shadow Fall.

"Although they’ve shared the same planet for thirty years, the Vektans and the Helghast are now on the brink of war. With both factions eager to protect their home and reclaim what they believe is theirs, trust has reached an all-time low. The wall built to separate both sides can no longer contain the enemy.

In Killzone:Shadowfall, you’ll serve as a Shadow Marshal under Vektan Security Agency director Sinclair, who has you perform the difficult missions that ensure the balance remains tipped in favor of the Vektans. But Echo, an intelligence operative for the Helghast, has similar orders – and she will stop at nothing to accomplish them.

To bring these two key characters to life, we are very pleased to have secured the amazing talents of David Harewood, who plays Sinclair, and Jamie Gray Hyder, who has taken on the role of Echo." (Source: Playstation.Blog)

And here are the ingame models of those characters, which in my opinion look pretty incredible (I know this has been out for a while but I just discovered it and thought that there maybe are a few other people who haven't seen it yet):

Next gen is looking pretty fucking good to me.