Looks like this one slipped under the radar: Back on June 12, Fight Night Round 4, producer Brian Hayes told IGN that button-mapping - controversially absent from the initial release - might be offered as downloadable content at some point.
"No, there is no option for face button punching in the final version, but we are investigating providing the option via DLC," he told the site.
Internet opinion seems to very much in favour of buttons returning to the game as per FNR3, so we'll see if EA comes up with the goods or not.
Fight Night Round 4 is currently available for PS3 and 360 in a local store near you. We haven't got our copy yet, sadly, but the demo was good, good, good.