It seems like Apple is going to encourage its users to make more selfies by greatly improving its next iPhone's front-facing camera. At least, code hidden within iOS 9 files explicitly hints at it. Taking advantage of the first beta of iOS 9 released for developers, programmer Hamza Sood has found out that the code suggests support for flash in the next iPhones's FaceTime camera.
Such file names as "Front1080p120Supported", "FrontSlomoSupported", or "Front PanoramaSupported" suggest that the front camera will be able to capture 1080p video, record in slow-mo mode at 240fps and include a panoramic photo feature, probably, for large group selfies.
Surely, these are only assumptions, and there is no guarantee that Apple will introduce these particular features in the next generation iPhone. Nevertheless, it seems quite likely that Apple will choose to make some improvements to the current iPhone 6's front-facing camera shooting 1.2 megapixel stills and 720p video and supporting burst mode and time-lapse.