Looking at the artifact calculator
http://beta.wowdb.com/artifact-calculator
Choice mentions:
Assassination
Bag of Tricks - we've been asking for this of years! Very happy to see it.
Urge to Kill really makes me hope that Vendetta is finally off the GCD.
Shadowstep exists still, hooray
Blood of the Assassinated - now this is a wierd one, I feel like this is going to build up for as long as you want making it a gamble to build with you betting against your life. No idea if this is good design, but I like the concept.
Outlaw
Curse of the Dreadblades - another talent that has betting against our life, feels far more 'warlock-y' this time though
Subtlety
Army of One - Shadow Clones are still a thing! Feels a lot simpler here, no doubt this fails to translate to theorycraft again.
Embrace of Darkness - depending on how strong this is, this could be fairly important.
Faster than Light - I don't know how good this is, but it's a really nice idea haha
Second Shuriken - title very mismatched to ability, perhaps this is gone now, which is good because it's stupidly OP.