Halftrack, I agree on both points. However, if it really was a single shot and not a pano...there is another type of distortion that also seems to be missing, and is even harder to correct...if it can be done at all: Rectilinear distortion (if that can be corrected, I don't know how.) To "correct" it, you could add barrel distortion, but I'm not sure that necessarily corrects rectilinear...and in any case, the picture seems to have neither type of distortion...yet it is quite a wide angle of view. So that almost rules out a single shot wide angle lens in my opinion. That leaves us with either a stitched pano...or single shot pano (which means a film camera).
I agree, there probably is a way to array perhaps 3 or 4 cameras around a point, where there would be very little overlapping distortion to correct for. And again, to take that to the extreme, it's even possible those cameras were shooting full motion video, rather than multi-shot stills. Which also means it could have been an array of 4k cinema cameras...I mean, there is a lot of star power represented in that picture...hundreds of millions, if not billions of box office dollars represented.
So could it be an array of vertically oriented (portrait mode) 1Dc's? Or even higher end cinema cameras? You would have thousands of frames from each one to select the "best" shot. I guess I could be overthinking this, and it would mean an absurd amount of man hours in post. But think about it...even if this particular picture weren't done that way...it is possible to shoot panoramic stills in that way...by arraying several cameras and shooting video with each one at anywhere from 24 to 60 fps.
It's sort of the idea of the circle of motion cameras that would freeze athletes or wildlife like sharks, and then pan around them 360 degrees. Only with a single point array of cameras, you're capturing a panoramic full motion video.
Come to think of it, that's not a bad way to shoot a movie...I just thought of a whole new movie category!! Panoramic movies...let's get to work on one now!