The EDGE article also mentions there's items that appear each round (which can switched off in the options menu). One powers up your super, one heals you, and the other is a time bomb that you and your opponent can "hot potato" back and forth with punches until it explodes.
mewtheed on the Nintendo Switch Reddit found one of the items in the last direct.
It's from the 2v2 part of the direct. When you punch the drone it drops the item.