If you pardon the pun, its been put back on ice yet again.
In part, the appointment of John Lasseter as CCO. He started out as a hand drawn animator and knows that's what the Mouse does best.
It then allows them to have two distinctive studios - WDAS doing the 2D and Pixar doing 3D.
Although thats not exclusive - JL did want to allow any WDAS director to pick which medium they think best suits their stories - so there may be the odd 3D flick from Burbank every now and then.