To pragmatically help CiviCRM step-by-step to support PHP7 I would like to know what the minimum and recommended changes to CiviCRM to support PHP 7?
This will help developers to identify areas of interest in order for issue https://issues.civicrm.org/jira/browse/CRM-17789 (PHP7 support) to be available.
PHP7 is significantly faster and PHP 5.6 will lose support august 2016 so it is wise to slowly work towards getting CivCRM ready for PHP7 :-)