I haven't been following all the rumours but has anybody considered that Rey and Kylo Ren might be brother and sister, perhaps even twins to mirror Luke and Leia from the Original Trilogy? The way the positions of their heads are so similar and facing in the same direction in the poster, while Finn is facing in the other direction, and the way their weapons intermesh suggest that there could be a special connection between the two characters. Could Vader perhaps be his grandfather, which would explain even more his reverence of him?

I also read somewhere that JJ said that Kylo Ren will be going through his own character journey in this film. That would seem to suggest that he could survive this film and be an important character throughout the whole trilogy. Perhaps he might go through a similar character journey as Zuko does in the three seasons of The Last Airbender. Looking at that poster and the positions of Rey and Kylo Ren, the possibility just jumped out at me. Has anybody suggested anything similar or have the already existing rumours debunked such a possibility?