Our very own Viral has an avalanche of rumors at his site:
At first I was like 'pttf..yeah right' but from what I read, it's reasonable and I can see Lucasfim doing what is being rumored.
Essentially what's cover in the link is that JJ and the rest of Lucasfilm team are going through the EU, and see which character fit into Episode 7. But when I say 'take' it's more like influenced.
For example, if Luke does have a wife, her name in the film won't be Mara Jade, but rather, a character inspired by her and other female characters in the EU.