Here are a few technologies that Drupal developers can try to catch up, before the bleeding edge deems them harmful legacy:
- GraphQL is a protocol that allows for easy communications in server-client architectures. Since it's launch in 2015 the protocol has gained momentum and now going into 2018 GraphQL is gaining critical mass. With many mature client libraries like Apollo and Relay Modern on the market, there is no shortage of server implementations either. For Drupal there is already a module in development that allows developers to use Drupal with GraphQL.
For Drupal developers this is great as you can choose to build on the same skillset as above to build decoupled sites and applications using familiar technologies, but you can also decouple yourself from a single CMS because React and Next are all universally applicable and can be used with any GraphQL capable CMS.