Overview
2XKO is Riot's 2v2 tag-team fighting game, and it's slated to hit PCs for closed beta on September 9th. For all intents and purposes, thought, it'll be the official launch of the game as Riot intends to keep the live service up and running outside of any regular maintenance such as patches. And while the game is slated to also hit XBox Series X and PS5, it'll only be available to PC to start.
Sign Up
You can sign up here. All you have to do is log in with your Riot account and then click a couple of buttons. If you already played during Alpha Lab 1 or 2, then you're already going to be granted access -- even if you played those phases on a console (though you'll only have access to the PC version like everyone else).
New Champion: Vi
Dev Update
And here's the full dev update if you want to watch it!