My favorite quote from the Star Wars announcement was "Well we're still working on the detail of the designs, but the renderings you're seeing today... they should give you a very good sense of the level of immersion...." . Meaning "we don't have any plans finalized yet but we had some artist draw these so we had something to show you even though this isn't what you're getting." I think it's safe to say this will have an Avatar timeline, 5+ years away.