It's technically Mewthree, rather than a form. Every official announcement states that it's a brand new pokemon, with similar traits to Mewtwo. In short, it could be a more perfect clone of Mew or something.
I'm not saying you're wrong, 100%, but I don't think that drawing on the link is legitimate ;v; The forms on the bottom both look nothing like the confirmed Pokemon, save for the colors and the head-tail. Plus the art doesn't look too much like actual official art.
But nowhere does it show that drawing, nor does it mention it being a new form..
It just says it's a new Pokemon, which could easily infer it to being either another clone of Mew or something else entirely. I know the Pokemon itself is confirmed, but it isn't confirmed exactly where its place is in the Pokemon family lines.
Oh i was just saying that the pokemon is a legit thing. They did not say what is was going to be. I thought you didn't think the pokemon was a real thing. Just like with Sylveon and the others released we are not going to know crap until they want us to. All we can do is speculate and what not.
I am still confused about what you mean about not showing the drawing.