It doesn't actually dance; it just bobbles its cute li'l head. But that's how we all got started.
Aside from the accessory figure that comes with the insanely expensive Hot Toys Rocket & Groot, this is the only official version of Dancing Baby Groot in toy form so far. I feel pretty certain it won't be the last.
Per Marvel's Ryan Penagos, pricing and preorder information will be revealed Monday. I hear it's going to retail for $IAmGroot.99, and be available online at IAmGroot. Consider that just a rumor, though.