The Moviefone article with Jim Hill's quote states that two things will happen (1) "Frozen" will replace Maelstrom at EPCOT in 2014/2015 (2) a larger "Frozen" attraction will be built in Disneyland.
I would bet GOOD money that neither of these happen within the next two years (though I would be ecstatic to be proven false). First, IMHO MyMagic+ is currently a billion-dollar debacle. There are numerous substantiated reports that the project is grossly over budget, behind schedule, and has not yet generated the impressive "higher spending per guest" the project promised. So, financially, I don't think Disney could fast-track a quality "Frozen" attraction without fixing MyMagic+ first. Also, I think "Frozen" would further delay any projects at Hollywood Studios (i.e. Star Wars land, Cars Land). Assuming those projects haven't already been cancelled or value engineered to death.
Second, Disney World attraction construction moves at a glacial pace (pun intended). Current example = 7D Mine Train. I can't fathom how Disney can go from "blue" sky to attraction in 18 months. That feat would be extremely difficult for any theme park to pull off, much less Disney World who seems to prefer spreading construction costs over several fiscal periods. At this rate, I'm hoping we really can step foot in Avatar land in 2017.
Creatively, Disney World is a mess right now. Rant over.