We don't know exactly what's going on just yet, but you're advised to head over to the band's official website. Right now. Go. Do it.
Aside from that creepiness, the band posted this on Twitter and the following image on Facebook:
In other Slipknot news, the band'sKnotfest festival will return to California in October for three days of heavy fucking metal. Have a scan over the poster below for the full line-up, and yep - that is a newly-reformed Atreyu on the bill!
Further to that, a two-day Knotfest Japan event will take place in November, with Limp Bizkit, Korn, Trivium, In Flames, Lamb Of God and a host of others joining the 'Knot on the bill. Full details for Knotfest Japan can be found over at knotfestjapan.com.