Very odd marketing going on.
It seems like Riot is teasing Thresh coming to 2XKO, and they're doing it in the weirdest way possible.
Seemingly every single dev on the 2XKO team has changed their profile name and picture, and then posted the following message:
Why don't we make a deal, Senna?
I'm not sure if The Wretch is just a nickname of some sort, but the profile and picture and the posts insinuate that it's Thresh asking something of the Senna who will soon join the 2XKO roster.
For those unfamiliar with League of Legends lore (basically everyone), Thresh used to be a messed up evil guy who was turned into a messed up evil spirit by the arcane power he used to protect. As a cool, glowing skeleton, he would go about tormenting people and trapping their souls in his lantern. Senna was one of those people, and managed to not only escape but also gain new powers in the process.'
The deal is might be some sort of reference to this interaction, but it's hard to be certain. Though surely we'll soon see what this is all about, likely when Senna releases on July 9.