Crazy4wdw said in the second post that Imagineers at
D23 told him late 2013, I was going by that.
Considering the pace of construction at WDW, that seems optimistic. But who knows. I don't see why they'd deliberately underestimate the construction time, so I'm sure they really believe they can get it done by late 2013 if that's what they're saying.
Whether or not they really do get it done by then, of course, is another story.