So, Lucasfilm and Disney have ruled on the Expanded Star Wars Universe and… it’s all out. The six films and Clone Wars (which I guess George Lucas had some role in?) are canon, everything else is not.
I’m surprisingly okay with this. I like Mara Jade and Kyle Katarn as much as the next gamer who played the Jedi Knight series, and I’ve even enjoyed some of the books (although I really ought to read more of them). However, I do think this is the right move, as a single unified continuity is key to making Star Wars VII-IX work.