2016 will see the rise of the phonewatch.
A whole bunch of people will want a phonewatch so they can have all the things they need instant access to on their wrist. They are sick of carrying around a smartphone and having to dig it out of their bag a hundred times a day. They may or may not want to carry around a separate device for browsing the internet, chatting or playing games. But if they do, that device will be a tablet as big as is conveniently possible. It must be light, easy to get out and put away and able to be ready to use immediately. Otherwise it will just get left at home.
For those who only want one device, and usually dont take calls or send messages on the fly, they will continue buying phablets between 5 and 6 inches. Big enough to use for most internet things, small enough to go in a pocket. 2015 saw the mobile world establish that convenient form factor. It will continue to be very popular.