He's in the main XML file which I don't have handy at the moment (I'm on a different computer). You can search for spider_man_superior to find it. They only have the initial sketch of his powers, so he's still very early in development. He wasn't in the code two weeks though, so it's definitely a new hero.
Looks like Shadow won't be happy since he's "Superior" and Miles "Ultimate" Spider-Man's #1 hater.