Who are the Dark X-Men?

Marvel.com has posted a teaser image without really any other details on what exactly they've posted. It appears to be a new team of X-Men featuring Namor, Emma Frost, Wolverine, a returning Professor X, Cloak & Dagger, maybe Angel (or his brother?) and another character I'm not real sure about.

Scott Snyder Reveals When American Vampire, Wytches Will Return

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