Technologies that interest me for 2018:
'Real-time' web I believe will become prominent. Currently looking at FeathersJS with socket.io and Primus, in conjunction with MongoDB / RethinkDB, and comparing them to Google Firestore.
GraphQL feeds into this, with Subscriptions, but also offers a flexible way to provide an API that bridges multiple data sources and query engines.
PWA - Progressive Web Applications capable of providing an acceptable experience for mobile.
Offline First - for this, a combination of possible approaches, with PouchDB, Google Workbox, etc.
SSR and Static Site Generation - Nuxt.js and Vue provide a very good workflow for this, as do Next.js and React.
Serverless - 'Cloud Functions' - including being used for page rendering (SSR / Static).
CQRS/ES - with .Net Core, and potentially a port of my approach to Nest.js.