Seth's definitely the face... the Rollins/HHH match probably won't happen until Mania, in the meantime he'll feud with Owens, somehow that'll transition into maybe a Jericho feud thru the winter, then leading to the HHH feud for Mania.
He'll likely do well in this role, I was wondering when HHH was gonna pop back up, because it seemed like Rollins/HHH was about to happen anyway before he went down w/ the injury. Also explains how Rollins came back and Steph told him 'things have changed'.
I see it playing out as... the Authority was behind Rollins, but he 'let them down'... by always needing their help, by getting injured, etc... so HHH figured he couldn't depend on Rollins and instead picked someone who could get the job done.