If you're rusty on your Warhammer 40K, I'll point out that this gentleman on the cover is a Scout, not a full Space Marine, which you can tell because he's wearing Scout Armor. The coloration and markings make clear that he belongs to the Imperial Fists Chapter (as if the "An Imperial Fists Novel" didn't clue you in). If I recall correctly, this will be the first novel to focus solely on the Chapter since Ian Watson's Space Marine, published back in 1993, though Imperial Fists have cropped up as supporting characters in any number of novels and stories since then.

Before starting work on the novel, I wrote a short story featuring the three main protagonists, whom we follow through their recruitment by the Chapter through the early missions as Scouts. The story, "Gauntlet Run," appears in the forthcoming anthology Heroes of the Space Marines, and takes place inbetween chapters right in the middle of Sons of Dorn. And hey, look at that, there's an Imperial Fist on the cover of that one, too.

That, by the way, is a Space Marine, a full-blown Battle Brother of the Astartes. Big fellas, aren't they?

UPDATE: I completely spaced yesterday, and forgot to mention the man behind that awesome cover illustration. It's Hardy Fowler. Sorry for the oversight, Hardy! Terrific Work!