I think that R+L=J, but I've waffled back and forth on whether or not it could be that Ben is Jon's dad, and Ned just decided to take the fall for Jon and the honor of being the First Ranger.
I don't think that Jon is Azor Ahai. I believe that Azor is Jamie and that to get the Lightbringer, he has to kill Cersei. I think in the next book that Lady Stoneheart will hang Jamie, and Jamie will be reborn as Azor Ahai, and ascend to his position of being the light against the coming dark.