Well "Vader" being brought back from the dead confirms the death of EU....damn Disney.
they never said Vader would be back from the dead.
There is a RUMOR that says
"He's an integral part of the franchise. Replacing him is virtually impossible," before adding "The plan is for him to return and play a significant role in the new films."
That says nothing about how he will come back who he will be or even how much he will be in it.
Again thats just a rumor and nothing more.