It's possible this pic obtained by Phandroid is the upcoming HTC One M9. It's also possible that it's what's known in the biz as a "Fake ID" — the guts of an upcoming phone in the body of something else to hide what it'll really look like. (Here's an example of that from the M7 era.)
So that third button down the right-hand side? Who knows.
Those pants? Sadly real.