Because there exists confusion with naming it by its generation (6th) and normal people inquiring about why there's no iPhone 5, I'd bet the naming/numbering scheme drastically changes. We'll see either the iPhone HD or iPhone LTE. Then subsequent iPhones will drop the additional naming detail and simply be described by their year of release.
As for features- larger screen (not too large though, maybe 4in), inductive charging (let's face it, wired chargers are annoying), better quality front camera (it's currently not very good), and perhaps some variation on how iOS looks/operates.
As for features- larger screen (not too large though, maybe 4in), inductive charging (let's face it, wired chargers are annoying), better quality front camera (it's currently not very good), and perhaps some variation on how iOS looks/operates.