Theory on Kylo Ren
I thought about another possibility for Kylo Ren in Force Awakens.
So far we've heard that there's been a big search over Anakin's/Luke's Old lightsaber. As we know in Episode 5(Empire Strikes Back), Luke fought with Vader and lost his hand and therefore the lightsaber with it. Now the lightsaber was recovered and it landed to Leia and somehow in Finn's hand. Now what happened to the hand that wielded it? Back in the EU, that hand produced a clone called Luuke Skywalker. What if Kylo Ren ends up representing Luuke in some form or fashion? There is a few signs that this too could serve as a possibility;
1. In the Trailer, we have seen him looking for Vader's burnt helmet and has the determination to finish what he begun.
2. In a talking action figure, Kylo Ren claims that the "weapon is his". This could be referring to Kylo Ren claiming the Lightsaber for himself, for Luke or Vader, or in general in the name of the Skywalker Family.
3. When Luke fought with Vader, Vader cut off his right arm. In the trailer, when Kylo ren holds his lightsaber, He holds in a right hand position. In every shot he's in with the lightsaber, it is always held in a right-handed position.
This is another idea that came to me that may contribute to Kylo Ren's identity in the Force Awakens.