I no longer have the inside scoop on everything there, but from what I've heard - 2013.

Done right = 6K (or better yet, 8K), 4:3 aspect ratio chip. I know there were talks (they may have never gone any further than that) of doing an anamorphic lens, so that they could pack a squeezed 6K (or 8K) image onto the entire 4:3 chip and unsqueeze it optically.

If it's 4K they're done before they even start.