As many of you (especially fans of the Chinese LoL scene) may know, some of our older skin and champion splash arts are different across the world. This is a big deal - splash art is one of most important tools we have for conveying a champion's fantasy and personality in League. We want players to have a global, unified experience - it's confusing when (ex.) Taric or Goth Annie have vastly divergent representations of their power and feel depending on which region you play League in.
Splashes are used everywhere: from champ select to the loading screen, portrait icons, the store, and more recently Hextech Crafting. With that in mind, we'll be updating a large number of our older splash arts to unify them across all regions. You should be seeing the first batch in today's PBE (and onward throughout the patch 6.7 PBE cycle), with another batch coming later in patch 6.8!
Edit: Thanks for the feedback everyone. We won't be making any reverts or changes during this round, but this feedback will help our splash artists prioritize what to upgrade when they get the chance. I mentioned this in a comment, the benefit of making these changes is to eliminate a pipeline that has been causing us internal pain. We know some of these aren't as nice and the art style is off, but choosing one splash or the other was the fastest way to kill this pipeline. We want to focus on new content and features, not firefighting and changes like this help us do that.