The key initiatives in Drupal 8 are:
- Configuration Management
- Views in Core
- Web Services
My 4 favourite issues in Drupal 8 are:
Fix toolbar on small screen sizes and redesign toolbar for desktop
# Issue 1137920 brings up an all new dimension to the admin menu in Drupal 7. The Toolbar is not only responsive, but also brings with it a sticky vertical bar.
Move breakpoint module into core
# Issue 1734642 brings breakpoint module as part of Drupal 8 core. Breakpoints is the basis for responsive design. With Drupal 8 shipping with responsive themes, breakpoint module introduces an interface to let themes and modules share their breakpoint configurations.
Module page redesign 2.0
# Issue 1790280 makes the module page cleaner, shows minimum information upfront.
Move picture into core
# Issue 1775530 allows responsive sites to use responsive images. Responsive images means loading images based on the width and height of devices, the screen display density or even the bandwidth of the device from which it is accessed.
There is so much happening, want to help, checkout Drupal 8 Updates and How to Help and get started!