Darth Lars said:

I think that a decision to rub out the existence of Mara Jade, Jacen, Jaina, Anakin Solo and Ben Skywalker would be a giant middle-finger to the Star Wars fan community.
Outside the little group of "Original Trilogy Only" die-hards on this and other movie-oriented forums, there is a great community of Star Wars fans out there who have embraced the dozens and dozens of books that have been published since the Thrawn Trilogy.

I do expect some things to be pulled from the EU into canon - which has happened before - , but we don't know anything yet about anything because nothing of Episode VII's plot has been disclosed yet.

I don't expect anyone to care about the specific stories, and about various side characters, though. Also, people wouldn't mind if some details are different or of some of the character traits of the Solo and Skywalker children were different.

They wouldn't have done what they did to the EU unless their hand was forced. I can guarantee you right now that VII will completely contradict everything that has happened postROTJ before now.

The biggest indicator of which is that from the evidence we've seen the Solo's only have one child. I doubt her name will be Jaina but we'll see about that.