It it happens to be the case, this will be the first time that native IMAX film has been scanned, downsampled, re-aspected, and rotoscoped for use with digital 3D projectors.
Occam's Razor tells me that Abrams may have just convinced Paramount to drop the post-converted 3D plan altogether.
Instead of having 3 versions of the film...
Native IMAX projectors- 2.39:1 35mm film footage interspersed with 1.43:1 70mm footage (a la Dark Knight, Mission Impossible 4)
2K and 4K digital 3D projectors, "LieMAX"- 2.39:1 35mm film footage scanned to digital, perhaps cropped to 1.85:1 for better 3D viewing, rotoscoped for 3D conversion (a la Clash of the Titans, Captain America)
All 2D film projectors in older auditoriums- 2.39:1 35mm film footage displayed in it's original scope aspect ratio, 70mm filmed sections cropped to be seamless with the 35mm footage
...they may just decide to cut out the middle one and do it exactly like Ghost Protocol.
EDIT:
I have used my powers of internet deduction to agree with those saying that Benedict Cumberbatch will be playing Gary Mitchell.
http://en.memory-alpha.org/wiki/Gary_Mitchell
There was an "inside source" back at the end of 2010 that tried to dissuade rumors that Khan was the villain, saying that:
“It’s definitely a character that will make fans of TOS excited. Think along the lines of Harry Mudd or Trelane or Gary Mitchell or the Talosians or the Horta. Actually it’s one of those that I named.”
Why not continue the reboot of these characters by telling this timeline's version of TOS 1x01? The movie starts out with Mitchell assigned as helmsman of the Enterprise, and first big event of the film is the mission to the galactic barrier. Perhaps there are flashbacks to the years of Kirk's time in the academy with Mitchell that we didn't see. He then gains all of his strange abilities, and the plot can go whichever way it wants with them.