It'll be very interesting to see where they take Episodes VII, VIII & IX. There has been so much done already in books and comics as part of the Expanded Star Wars Universe. In the past, I always assumed that George Lucas ultimately had the last word on what was canon and what was tantamount to fan fiction. But George himself stated that he's looking to pass along Star Wars to "a new generation". So who knows what will be adopted into canon, and what will be rendered incongruent.
In my opinion, if the new Star Wars movies are actually called Episodes VII, VIII & IX, I feel that they must continue to follow the Skywalker family. Given that Episodes I, II & III primarily followed Anakin's journey, and Episodes IV, V & VI primarily followed Luke and Leia, I think it makes perfect sense that Episodes VII, VIII & IX would follow Ben Skywalker and Jacen Solo.
I think there'd be something of a revolt if all of the Expanded Universe characters were ignored completely, but I can't imagine the new movies being slavish to the EU stories. It'd be a shame to not have Thrawn in the movies. I could do without the Clone Emperor though, as well as the Yuuzhan Vong and Chiss.
So I'm envisioning something of a "cherry picking" scenario - taking bits and pieces and characters from the EU, but moving the timeline around. I think the main thrust of the story should be Jacen training Ben, Jacen turning to the Dark Side and becoming Darth Caedus, and then Ben, and Jaina and Anakin Solo teaming up to defeat Caedus and the Imperial Remnant. Thrawn could serve as the main villain in Episode VII, Lumiya as the main villain turning Jacen in Episode VIII, and then Jacen/Caedus as the main villain in Episode IX. That keeps it "all in the family", so to speak, and without the need of getting into "phantoms" and huge, outer-galaxy alien threats and all that. Luke, Han and Leia could have small roles and cameos - maybe Jacen could kill Leia instead of Mara Jade.
This would clearly eff up the EU timeline, but I think it condenses the Skywalker/Solo family drama, keeps the best villains, and discards the rest without outright saying that none of the events in the books or comics or games ever happened.
Of course, the REAL joy will be in seeing what Disney does with Indiana Jones! Which, as we all know, was just Han Solo's dream while he was frozen in carbonite...
