The biggest piece of information we have is that Lucas turned over his treatment for VII to the art department, but he continued to rework the story with Michael Arndt, Kathleen Kennedy and Kiri Hart (et al) until it no longer resembled the treatment. This all occurred prior to J.J. Abrams fully coming on board This group (Lucas, Arndt, Kennedy, Hart, et al) developed the following key story ideas (among others) during this time: Luke in hiding, on an island or in a forest, dealing with emotional issues a tech-savvy scavenger girl, living in an AT-AT on a desert and/or junkyard planet, who finds a map to Luke and ends up fighting the "Jedi Killer" on a snow planet a "Neo-Empire" with a superweapon Han as an ageing smuggler and Leia in a position of power.
I didn't find the right solution from the Internet.