Carnage :
From Jennifer Heddle's (Senior Editor at LucasBooks, replaced Sue Rostoni) comments on Twitter, cataloged on Wookieepedia (that place is going to explode with the nerdrage of LucasFilm declaring everything non-canon):
JH: We don't consider it "erased" it's still there. As long as nothing new directly contradicts it, it's there to be used.
Q: Is this all EU or just post Return of the Jedi? I've always loved the Old Republic stuff like TotJ.
JH: All of it, but, we do wonder about that ourselves. So not 100% sure how that will play out? But consider Legends for now.
Q: So...everything that is (or was) the Old Republic Era is just...non-canon now? Revan, Meetra? All of them are just..gone?
JH: They're still there! But are they part of "official" canon, for now? Probably not. But they could be referred to in future
Q: What about the Old Republic era?
JH: That's something we've wondered ourselves. ;) Operating under assumption it's part of "past EU" but I guess we'll see.
Q: So does this include KOTOR and Star Wars: Legacy too? Or just anything around the time of the movies?
JH: That would all be considered Legends, now.