I think there is a lot of potential for a lot of the big players in 2016.
Apple will have a redesign year for the iPhone. Time to make some dramatic shifts, maybe? A dedicated back button for more consistent experience navigating through iOS? I know that sounds unlikely, but one can dream?
Likewise, for Samsung and their flagships, it's time to really nail that OS optimization down. If the rumor of them partnering with Google to optimize TouchWiz is true, it could be very interesting. And on the hardware-end, if the rumors are true that they are just planning to spruce up a few things, like add USB C, etc., it could be an amazing all around device.
Lot of potentials...