POTENTIAL SPOILERS FOR STAR WARS: THE FORCE AWAKENS BELOW!
Indie Revolver has posted some images today that appear to be “The Knights of Ren” concept art. I saw these pieces along with a few others that show “Knights” in the most classical sense of the word. As J.J. said this week:
“He is a character who came to the name Kylo Ren when he joined a group called the Knights of Ren.”
I believe the Knights to interact with rumors of “The Seven” and “The Clan” stuff we will likely see on screen in The Force Awakens.
This very well could be conceptual work for the Knights of Ren. However, they could also be Kylo Ren early pieces too. That said, early Kylo work did appear to become different characters like Captain Phasma and the trooper we saw at SDCC. So those designs clearly permeated the design of the film if they were cool but not as cool as the final Kylo design.