User blog comment:Saint7777/Personality Skins/@comment-3097946-20140405225304/@comment-3097946-20140410165127

I don't think just because those skins have oriental references means that Riot Games was bought out at all. They're centered in the U.S. like always, and their primary shareholder in Asia helps distribute the game over on that end.

They usually release skins somewhat based on popular demand. Skins like Astronautilus, Popstar Ahri, Battle Bunny Riven, and even the recently released Void Fizz have all been suggested by players at some point.

Oh, and the Rumble skin itself is a reference to Tengen Toppa Gurren Lagann, an animation series in Japan.