We were rather smug about having wondered whether Little Mac would be making his Smash Bros. bow this year, after the reveal of an unnamed boxing ring stage, but Masahiro Sakurai's punctured our pomposity with a new reveal in today's Miiverse pic of the day.
In his caption, he wrote: "There are actually two versions of the boxing ring stage! This ring [above] is the Smash Bros. version..."...and this one is the Punch Out!! W.V.B.A. design. King Dedede really likes fighting in the ring, doesn't he?"
It's not clear if they'll be selectable, or whether there will be any major gameplay differences between the two, but Sakurai rarely makes change for change's sake. Perhaps we'll see updates in the coming days.