From Disney Magical Kingdom Blog. Images show the construction of the main mountain of Arendelle has now topped out and large regions of the rock face are already complete.
The roof of a lot of the shops is nearing completion and the reconstruction of the Fantasyland station meant as a connection point between the two halves of the new “Super Fantasyland” is also undergoing active changes.
Source: https://www.facebook.com/DisneyMagicalKingdomBlog/posts/4833368846683681