New features != "must have" features
Things like GPS for maps/directions, full desktop browser, multitouch screen, wifi, MEMS/gyroscope sensors, a camera of sufficient quality to produce acceptable pictures when picture-taking isn't the goal of one's day, the ability to install third party apps that have access to an API comparable to PC apps are a must have in any smartphone.
Stuff like fingerprint readers, eye scrolling, 64 bit CPUs vs 32 bit CPUs, quad/octo core CPUs, NFC, being slightly thinner than the previous model, 1080p screens versus 720p screens, and so on are niche features at best, gimmicks at worst.
Apple was the first to put all the stuff in the first paragraph together into one phone - though they didn't invent any of it. Since then, there has been nothing added to smartphones, either from Apple or Android, that contained something that nearly everyone finds useful and has become a must have for every phone made.
There is some room for new killer features to be added. Like say a screen that is a bright in reflected light as it is under its own light (i.e. doesn't wash out in direct sunlight) But that won't be an innovation of Apple, or Samsung (at least not the part that develops phones) it'll come from the CE industry and be brought to phones when it is affordable and there are no other compromises (i.e. they're available now, but are slow and have terrible color)