Source: https://drupal.org/drupal-8.0Drupal 8 will be the most customizable and adaptable release of Drupal ever! Drupal 8 offers countless new ways to customize data structures, listings, and pages, and adds new capabilities for displaying data on mobile devices, building APIs, and adapting to multilingual needs. There is something for everyone to love.
See also:
https://drupal.org/core/release-cycle
https://groups.drupal.org/taxonomy/term/98113