Small PBE update went out earlier, which included completed splash arts for the release Kha'Zix skin and the new Olaf skin.
Here are the two completed splash arts for the upcoming skins Mecha Kha'Zix and Pentakill Olaf.
Mecha Kha'Zix
Pentakill Olaf
These two splashes were pretty much the only changes in this patch so I would expect that things are just about ready to be pushed to live.