With the ever-growing presence of flying types that don't actually carry flying moves, Machamp's devastating Stone Never-Miss is as useful as ever. And being able to confuse things at will allows him to force switches and gain valuable momentum. Not to mention excellent bulky HP.
Talonflame and Fairy-types put a damper on all of this, but not enough to prevent him from doing his job consistently. The original fighting king is still a beast to contend with. His ResTalk set should still do pretty well, too, with the shift to bulky offense.
What are these flying types from Gen 6? (Perhaps Togekiss, who can be seen as a "new" Pokemon due to its new typing, or maybe Tornadus-T and Thundurus, as the latter has some play although the former is rarely seen) I probably do not know about them because it would seem that a flying type who cannot leverage a flying STAB without some compensatory stats or an ability would just be seen as Stealth Rock liability with no commensurate reward. Thus, it is unlikely I would see these Pokemon in OU.