Another thing I was gonna say is that this isn't entirely without precedent. I remember feeling a bit annoyed when the 2008 clone wars was set only a couple months after AotC, creating a continuity mess. Chee and Hidalgo said they'd eventually make a revised clone wars timeline, but then five seasons of the show happened and it became its own thing.
Even back in '05, at the end of the grand clone wars multimedia project, there was a kerfuffle over Labyrinth of Evil and part 2 of Genndy's cartoon not quite matching up like the official site said they would. It was either Chee or Hidalgo (can't remember now) who bent over backwards to make it all work.
What about the handful of old books and comics that brought up stuff George would later do his own way in the PT (Boba Fett's backstory, young Kenobi, etc)? Did that stuff get retconned or was it rendered non-canon? The Bounty Hunter game and the Open Seasons comic reference Jaster Mereel and Concord Dawn, so some of it was clearly repurposed even if it wasn't retconned.
One of the dark horse clone wars comics (from '02-'05) even used the chemical spill on Honoghr mentioned in the Zahn books as a jumping-off point.
Oh, and someone was wondering about the character from the Marvel comics that eventually made their way to higher levels of canon? That would be Lumiya, who was brought back for the Legacy of the Force novels.
Honestly, what's happening now is doing the same thing regarding post-RotJ continuity as The Clone Wars was to the existing '02-'05 stuff: they're doing their own thing, but also feeling free to incorporate EU elements as they like.
Obviously we won't really know where the chips have fallen until the movie is finished and released. Obviously the official policy is now "No previous material is canon except the movies and TCW," but that doesn't mean some of the existing EU can't still count (until something comes along to contradict it, that is). Even if a story is rendered non-canon, it doesn't suddenly cease to exist.
Besides, as someone in the comments section at badass digest put it, personal canon is the only one that should ultimately matter.
If you liked a story more than the official one that contradicts it, so what?