NEWS.updates.

Fastest Drupal ever, out-of-the-box. Comes with BigPipe, Placeholdering and other crazy stuff, and a better caching system.
New theme system based on Twig. 154 theme functions have been removed and replaced with Twig templates. This is one of the most interesting additions to the theme layer.
Symfony2 as a base layer for Drupal 8. Services, Dependency Injection and Routing are some of the paradigm shifts.
Everything is fieldable, well almost everything. Not only are there new fields, but you can now add fields in many more places.

Each day, more Drupal 7 modules are being migrated to Drupal 8 and new ones are being created for the Drupal community’s latest major release. Citiface developers are profiling some of the most prominent, useful modules, projects, and tools available for Drupal 8. This week: SEARCH API

What does the Search API Module do?

Each day more Drupal 7 modules are being migrated over to Drupal 8. Citiface developers are contantly watching some of the most prominent, useful modules that have been migrated. This week: Services.

What does the Services module do?

Services module provides a standard way for Drupal site builders and engineers to enable and build an API, which allows external clients to communicate with Drupal. Based on Drupal.org data, Services is in use on more than 37,000 sites.