User blog comment:Eman4evr/So uh..Warring Kingdoms?/@comment-24857138-20141017142337

One other thing. All the warring kingdom skins are Lunar Revel skins, so they'll only be made/released for Chinese new year. Also, it's unlikely Sion or Karthus will get a new skin because they both just got VU's. But Garen, Leona, and Yi are all very real possibilitys.