As far as IMAX formatting, I don't get why that's important when you're viewing it at home. Yes, there may be more clarity, but it would be like looking at a letterbox VHS movie on a 13 inch TV, unless you have an IMAX screen handy.
It's the same reason I don't want TNG or any other series cropped to 16x9 -- the original aspect ratio is always better. In this case, some scenes were filmed with IMAX film, requiring a different aspect ratio.
And yet: I saw it both ways in the cinema, as I saw it on standard 2k digital projection, as well as in IMAX.
The Blu-ray presentation appears to mimic the standard theatrical AR.
Take a look at the TrekCore review, it clearly shows that the bluray is cropped from showing the full frame as it was filmed. I won't argue that the bluray shows what was given in your standard theater, but this movie was pushed as being an IMAX film (lots of press releases, trailers, even special showings), therefore the original intent of this film was to be show in the IMAX AR.