Really when it comes to smart phones the things I would want are things not offered by most. - Stop being phobic about thickness already and make it durable. Nearly everyone has a case on it anyway which makes it farcical. - Boost battery life. - Easily accessible SD card, include service doors for a change, stop dropping features like headphone jacks. I admit to being niche but I think at this point improvements in the peripheral aspects are what could move people in addition to anything and even if they got every little niche people wanted it probably wouldn't keep the market from saturating without adding major new functionality.