As a matter of fact, they should just retcon the entirety of Episode 2. Make Boba mysterious again and leave his origins unknown. Then we can actually pretend that Anakin had a somewhat real/believable romance with Padme, as well.
He didn't kill Revan. And nah, don't need to retcon the whole prequel trilogy. A lot of the expanded universe stuff that came out of it was actually amazing, even if the films themselves are shit.
Except Episode 3, which I'm ambivalent about.
As creative consultant on the film, Lucas' involvement includes attending story meetings. "I mostly say, 'You can't do this. You can do that,'" he told Bloomberg Businessweek. "You know, 'The cars don't have wheels. They fly with antigravity.' There's a million little pieces. Or I can say, 'He doesn’t have the power to do that, or he has to do this.' I know all that stuff."
Lucas already stated, EU is not cannon. Even though episode 2 and all that mention Darth Vitiate. Which he is by far the most bad ass sith evah! he fucked REVAN up!
Aw, damnit. I was hoping they shoveled Lucas out. "I know all that stuff." No he doesn't. He's even admitted that his fans are way more knowledgeable about his universe than he is. Idiot.
Anyway, @KokorosMaster Revan is still not dead, as far as we know.
Actually, all ongoing projects are considered still canon. Since EA still holds game license to SW stuff, their works are still considered canon. They specifically addressed this at one point.