User blog comment:KaiserLos24/Hold on to your buffs - Riot's new teaser trailer/@comment-3974211-20150528000024/@comment-3329904-20150528163017

The "leak" with the pet and everything wasn't from 4chan, as far as I know. It was just another someone that claimed (in pastebin) some fake abilities for Ekko (a kit mostly focused on auto attacks- Such as the passive ability to perform a basic attack without cast time), Chosen Ekko release skin, an upcoming Riven skin, Arctic Ops Graves and the Master & Pet Champion. He also posted that two days after "Ekko: Seconds" was released.

But that's as far as I know, if you can enlighten me, I will be glad. :P