Drupal 8 the newest version of the Drupal content management system is around the corner and will be released Nov 19. PHP7 - the newest generation of the PHP language powering Drupal - will be released later in 2015.
TL;DR: After an extensive 5-day sprint during DrupalCon, Twig finally has landed in Drupal 8 Core and http://drupal.org/node/1987510 has been committed by the one and only alexpot
TL;DR: Update php-memcache extension to at least 3.0.8 or downgrade to 2.2.6. This can haunt Drupal sites using features especially and is quite hard to track down and leads to very instable system behavior.