Kylo Ren is not Jacen Solo.
I heard some rumors that Kylo Ren may be Jacen Solo but I don't think he is Jacen Solo however I believe that Kylo Ren will have some sort of connection with the Skywalker but will not be Jacen Solo. For one, Jacen Solo's influence to the Dark side was brought about by Lumiya(The Light Whip Lady), whereas Kylo Ren is suppose to be drawn in by whoever Serkis' Sith Character is going to be. Then they said that Kylo Ren's injuries were from a crash and had to go on prosthetic support by which he has that in common with Lumiya; Jacen Solo never had prosthetics, even after his fight with Luke and Jaina. Jacen never used a crossguard lightsaber, just the typical single blade. Then again the stories can change but looking at things now Jacen and Kylo Ren are two different characters. What are your thoughts on them?