Update: Oh yes, it's official, at least as official as Post 217 was. Look to the left of Maxwell, on the tank. Yep, there's Edison Yan's signature. Hype levels into overdrive!
Anyways, enough talk, let's take a look at it. I had to resize it for this post, so click it for the full version.
It's absolutely gorgeous. There's so much going on in here that it's hard to take it in all at once, though I definitely noticed the reindeers in the sky, the T-Rex riding a motorcycle, and what very much looks like Lock from Lock's Quest in the top left.
For now we'll call it a rumor until we get confirmation, but it's almost sure at this point it's official. So take it all in. It's definitely the best piece of art released so far.