PROJECT: Skins and Theories

I have one theory that I came up with when previewing the upcoming PROJECT skins.

Ok, first, listen to Ekko's login music.

Now, listen to PROJECT Yi's login music.

PROJECT Yi's login music uses parts from Ekko's music.

Is this a reference to something? Ekko has something to do with the slipstream and has a part in the "parallel universe" concept for the PROJECT skins.

Ekko and PROJECT champions story confirmed.