Don't think leveling stops magically at lvl100, just cause of the number.
Actually i hope we get in the new expansion the possibility to lvl 10 levels again, cause i am tired of the 5lvls per expansion cap, can't expierence all zones that way before reaching the cap. As allready mentioned everyhwere, the Garrosh weapon heirlooms seem to indicate that.
And yeah, its about time to finally see Pantheon Titans....bored to never see them anywhere. Not even in a CoT or similar Deus ex machina.