Minimalism:

• Less elements
• Less text, more videos, images
• More valuable content
• Single login/register button
• No hamburger menu
• JavaScript fatigue will finally start fading away, many experiments were done for last years, many frameworks written and re-written, many good and bad practices introduced, many tools build, used and failed; After playing people will go back to simple solutions that just work
• Web will be more accessible, many libraries will offer keyboard and ARIA out of the box. UI will be more personalized and configurable (users will be able to select themes, colors, font sizes right from the app settings); Apps will be more responsible to each user automatically
• Small animations, small interactions, Bots, conversational UI,
• Large, clean font size, nothing but main content visible at the time
• Less "cool", "beautiful", "unique" designs, just design which solves a small problem and is very easy to use, many apps will look similar
• Less adds
• People will believe social media less and will start thinking and tracking the original sources before sharing
• Machine learning algorithms will become better at detecting and automatically removing fake news, violence and preventing cybercrime
• Machine learning algorithms will be used more in browsers and mobiles trying to understand user's next step and what is he trying to find, solve, achieve, do. Many developers will start playing with ML libraries in JS and as a result mobile devices will need to recharge more often due to lot of calculations.
• Web will keep dying; Mobile, wearable, AR/VR devices and IoT will grow; New web specs will come for new devices, protocols and APIs
• Designer-engineer cooperation will become better, more human interface guidelines and standards will come
• Apple's popularity and UX leadership will start slowly going down a bit, while Microsoft will start conquering Apple's niche with it's future vision, UX revolution and technologies. Windows phone will be used more then in 2016. Apple still will lead and Swift popularity will move up.