There's a slight possibility that tdev was just teasing us with The Final Countdown and the Devblog post was photoshop or something...
This will be the last time I download something fast, moving to satalite :/ --- Post updated --- ****
So, Update Speculation thread... People have seen a soccer ball on the Devblog, so maybe a local multiplayer scenario, Rocket League-ish style (without the terrible physics, of course).