In terms of construction work, they done a whole lot of it already:
1. Foundation poured.
2. Utilities probably ready to be hooked up/conduit in place
3. Framing of the mountain has begun.
4. Parts of the roller coaster done, probably inside coaster track done first, then "mountain" is being built around it.
In terms of building a house, once you get the walls up and the roof on, you've got a good start. Of course, Disney will require months of artists doing the rockwork and other details.
I think that the construction has really picked up recently because when FLE opens (sans the Seven Dwarfs Coaster), it will be harder to move construction equipment/materials, in and out, unless they have allowed for a walled-off narrow pathway.
Here's how I would estimate the construction schedule:
January 2013. Rockwork has already been attached, and the painters are now working on the paint job. The entire track has been laid out. Horticulturists are planting trees and plants, work on any streams has been completed. Construction of Snow White's cottage is half-way done. (Rockwork for Cardillac Mountain Range I believe was in the process of being finished up about a year before Carsland opened, maybe a couple months less).
April 2013. Major electrical work is begun, plumbing, and the installation of the ride vehicles and system begins once rock work is completely painted and fake trees/plants added.
July 2013. Ride vehicle testing begins. Disney artists descend on the attraction to paint and add details to the queue portion of the ride.
October 2013. Ride vehicle testing continues, animatronics are added, or are fine tuned. Detail work continues, and rumors of a soft opening in three or so months begin. Horticulturists add shrubbery, other details. Work on Snow White's cottage nears completion.
January 2014. Fine tuning of animatronics and ride system continues, detail work is finishing up. Outdoor animatronic dwarfs marching on log are seen spotted by tourists peering over the wall. Ride to have soft openings in weeks, after more safety testing.