In a somewhat irritating (though nonetheless exciting) announcement-of-an-impending-announcement, Adult Swimrevealedtoday that they are currently collaborating with Valve on a new project involving Team Fortress 2.
They're not saying what the project is yet, but current speculation suggests it might be some sort of TF2-themed animated web series.
"Adult Swim & Valve are teaming up for something that you'll probably enjoy," reads the website. "To learn how their video game peanut butter will be getting in our network's chocolate, come back next week."
Taken as an isolated occurrance, this is merely "probably cool." But this is starting to look like a trend for Valve. Just this week we learned about their forthcoming collaboration with Overkill Software on a new level for Payday: The Heist. Maybe Valve is beginning to expand their properties through these types of small-scale partnerships.