I really hope that's not what Mega Mew actually looks like. If they ever make one they should at least keep what we love about it. It must still be cute. Mess up that one requirement and you ruin the whole Pokémon. The little guy above has two things that show he is not real. It isn't cute. More importantly, it isn't smiling. Never have I seen Mew look serious. Sad and worried perhaps; but never serious.
Plus the mega wouldn't be THAT close a copy.