The question shouldn't be if the main release is gonna be cropped but how much? I think, if you wanted a fixed cropping and didn't want to adjust for each shot, TServo's suggestion is right - basically, crop just enough so that the black boarder and the rounded corners are never seen.
I think a fun alternate version would be one that would be totally uncropped, like those frames in TServos post - including the soundtrack and all the boarders.