^ pretty much this.
Lucas said in the late 70's/early80's (in Starlog, iirc) that Ep. VII would take place decades after VI, just like there would be a large gap between Episodes III and IV. He also said then that Artoo and 3po would be the only characters in all 9 films. Since Artoo is the only confirmed character for VII so far, it sounds like George's prediction rate is the best of anyone. I'm going with what he said.
And for the record, the day I heard Disney bought Lucasfilm, I feared that 1313 and the Clone Wars would be cancelled, so my prediction rate is as good as the source mentioned in the first post. So....my current predictions are that the Story group will keep most of the Thrawn-related lore (like the planet Coruscant, which I think I've seen show up in a few different places) and use it to fill the gap between VI and VII; any stories in between III and IV are at risk based on the direction they take with Rebels; KotOR, SWTOR, and Force Unleashed will be included in the 'new' canon; and any stories after the Thrawn trilogy are at risk.