Really exciting trailer, with a probable large amount of misdirection and red herrings.
Beyond the obvious interpretation from the footage, a theory that could be picked up from all this is that the "raw power" both Luke and Snoke mention having seen once before is not Kylo's but Rey's. Rey seems to have trouble controlling her power at times, and it could be an interesting twist that Luke's Jedi Temple wasn't destroyed by Kylo Ren but by Rey in her youth as the result of a massive Force backlash when she lost control. Remember in the visions Rey had in TFA, she saw a first person perspective of someone about to smash her face in with a weapon and then getting backstabbed by Kylo Ren with his Knights in the background. Could it be that some sort of temple guard was going to kill her to end the disaster and Kylo saved her and was the one to hide her away on Jakku? It would also explain why in TFA when Kylo is told that BB-8 and Finn were able to escape thanks to "a girl", he goes into a rage and demands "What girl?!". It wouldn't make sense unless he already knew Rey.
The trailer seemingly hints that Kylo was the powerful "raw strength" that Luke saw previously though, and didn't handle it properly and as a result the temple and his students were wiped out. It will be an interesting story either way, but the theory above would be a pretty unexpected twist, and could bring a yet unexplored side to Rey's story, though maybe it would diminish Kylo's own arc a little too much if all the attention focuses on Rey.
If I had to voice one small complaint (though admittedly this is just a trailer), we saw twice the Praetorian Guards in Snoke's room and so far they seem to stay completely immobile in both scenes. Hopefully the marketing images where they are seen swinging swords, polearms and other cool weapons isn't just to sell toys (not only at least) and they'll actually do something. There's enough unmoving red guards in the saga so far, these could do something for a change.
Anyways, great visuals, great soundtrack, seems a lot of cool action scenes, I'm really looking forward to Dec 13th to check it out first showing here.