Drupal 8 is likely to be released around September. Fuzion have been driving the initiative to have CiviCRM ready to roll when Drupal 8 is released and there have already been some generous sponsors for our work to help get us this far. We have CiviCRM currently working on latest beta, and old friends like Views are working fine and you can give it a try out at http://civid8.fudev.co.nz/.
But there is still lots to do to get Rules, Entities and Webform working. A Make It Happen has just been launched, and you can help progress this work by chipping in here https://civicrm.org/civicrm/contribute/transact?reset=1&id=71, or you can get in touch with us about setting you up your own test suite.
If you are happy trying out your own installation, details can be found here https://civicrm.org/blogs/torrance/give-civicrm-drupal-8-test-out