This has been published on the Greek YouTube channel for Walt Disney Animation. On any other account I would have assumed it was a sneaky leak.
So, try to ignore the timecodes and enjoy the first look, and listen, at Frozen in motion.
As you may have noticed, that video was dated back to last Summer. Since then, Chris Buck has been joined by Jennifer Lee as a co-director.
I'm really not sure at all why Disney have released this… but I'm certainly happy that they have.