Team Fortress 2 has a new sports mode, where two teams run around with a ball trying to score goals. It's called PASS Time, and "combines TF2's usual fast-paced bloodsport with the actual fast-paced sports of soccer, hockey and basketball".
It's a collaboration between Bad Robot, Valve and Escalation Studios, the latter of which is working on DOOM and previously created Outlaw Space and Eternal Fate.
According to the post, gameplay functions a lot like the Bombing Run mode from Unreal Tournament 2004, where the ball replaces a player's weapon once picked up. "Pass and shoot with your primary fire. Pick up and intercept by simply touching the jack. Melee an opponent carrier to steal."
You can find out more about the mode on the Team Fortress 2 blog.