I found another video showing the same costumes and props from some different angles and I noticed a few more interesting details.

https://www.youtube.com/watch?v=oKrFZBncjmU

One interesting little detail is that Rey's goggles seems to have been made out of the eye-piece of an OT-era stormtrooper helmet. Other than that the video shows a lot more details on Kylo Ren's lightsaber. Looking at the design you really get the idea that it's something very unique, most likely something that he's cobbled together himself. If this is the case then it would explain the uneven saber-beam that we saw in the trailer.

Also as a side-note, am I the only one who get's the impression that the two 'beams' on the side are more like vented plasma (or whatever lightsaber-beams are supposed to be made of) rather than two extra lightsaber-beams. If Kylo ren's lightsaber is "home-made" then it could simply be that the two tubes at the end are there to serve as vents. I could be stretching this speculation, but the 'beams' really look to pointy to be regular lightsaber-beams. They look more light the spark coming out of a welding-torch.