So, the leaked poster is legit after all.

Apparently, the
Sith Troopers were established in the EU.
Maybe I'm being cynical, but they seem like something out of fan fiction. Not the worse thing, I suppose. But, light years away from the
risk-taking approach of the PT:
Doug Chiang wrote:
It was terrifying because I’d assumed when I was hired that I was going to do more of the classic designs. I had no idea where George was going to go in terms of design aesthetics.
And so that’s why it horrified me, because I’d been doing homework, studying [original Star Wars concept artists] Joe Johnston and Ralph McQuarrie, so that I could do original trilogy designs. And during one of the first meetings, George said, “You know, forget about what you think Star Wars design is. We’re going to start over. We’re basically going back 30 years to lay the foundation for all of that to explain why designs in the original trilogy look the way they do.”
And that completely floored me because I wasn’t sure what George meant. I didn’t know stylistically what he wanted to do. It scared me because literally I felt like I’d prepared for the wrong test.