A couple of emerging technologies
that looks very promising, and which I will keep an eye on
in the coming year are: IPFS and WebAssembly.
IPFS is a distributed, content addressable data storage.
The current version is implemented in Go,
This could become a base to build decentralised applications.
WebAssembly is a low-level/intermediate language
necessary to make optimised code.
WebAssembly will likely become the compilation target,
and what you write, when you need extra bits of performance.