it does looks like a buff, but i don't see the point of showing a nude dude raising his hands for a buff... so i think it's something about the GENKIDAMA
this has been in the game files since that time netmarble released a patchnote where they were showing people using and releasing genkidamas, where that would have been a move in a new update ( few will remember this) , but it just didnt happened back in the days. It was that update where they added the weight system.
Please don't let this go to fighters, please to all of the kai's of otherworld, don't let this skill go to fighters. Let's hope this isn't just for fighters and is for all Human classes, if not everyone (As much as I hate SK's).