Rumours are popping up: http://makingstarwars.net/2016/05/star-wars-episode-viii-the-knights-of-ren/
Sounds interesting, if true. Might be having Luke be a little too violent, however.
Not much of a surprise. Seeing as how Daisy, Mark and Adam were all seen in Ireland I assumed the KoR would be coming too. Even with his training completed he needs their help for fighting the likes of Luke.