On a kinda related note am I the only one who wants an ork execution which is them literally jumping up and down on a body just going "ZOG YOU ZOOOG YOOOOUUU!"?
Well for the orks it is not uncommon to taunt and laugh when they slay a weaker enemy so it be easy to see orks getting interesting and humorious executions, while the eldar are more about being quick and not wasting their time, SM are more about slaying anything not SM, and CSM just jerk off on dead stuff.... Looking your way @Ideas_McGee
I dunno if I agree on the SM part. At least to me, Marines are knightly and honourable, even to an opponent such as a Xeno, which leads to them mucking about how some races are less honourable than others and so one, and Chapters like the Flesh Tearers, Raven Guard and Raptors being held as "not honourable" because of their ways - Heck, the Black Templars are hailed as true warriors of the Emperor and right knightly fellows, whole giving less than a damn about the Imperium itself! I'd suppose they would kill their enemy in a coup de grace, like stabbing a downed foe in the chest to quickly end his pain, or shoot him at the head to show superiority. Hands-on and brutality would be a no-no to most, I think.
If Chaos Space Marines cannot equip flayed skin capes, somebody has failed somewhere in the art department. More then just brutal finishers, I'd love to see Chaos specifically to get serious M rated items that will make all the helicopter moms of America scream to ban the game (hell, free publicity too). Something like the Night Lords being able to nail the still-living crucified torsos of their enemies to the front of the rhino would be wonderful. Much like Dakka, the answer to violence in 40k is always more.
Guess its a good thing the devs already have Quad Guns implemented in the game. Thinking one step ahead.