I am hoping for a big reveal is akin to the Scoobie Doo live action movie - that the whole evil plot is orchestrated by Jar Jar Binks, the most hated "good side" character of the series.
https://www.youtube.com/watch?v=JC2TvxRIR4Y
Or my other pet theory is that R2D2 is really the Sith Lord behind it all from the beginning.
Edit:
Here is the movie I want to see
https://www.youtube.com/watch?v=ZLo80ugXahk
There was a mashup of the trailer that some fan had done that had Jar Jar in almost every shot. It was kinda funny.
I think it would be far more effective if Kylo Ren were actually Jar Jar. The final scene of the movie, after not having seen his face the entire time, he turns to the camera:
"Meesa Jar Jar Binks! Meesa joined the DARK SIDE!!!"
Fade to black.