In [policy, no patch] Require hook_update_N() for Drupal 8 core patches beginning June 24, the Drupal 8 release managers outline a policy to begin requiring hook_update_N() implementations for core patches that introduce data model changes starting after the next beta release. The goal of this policy change is to start identifying common update use-cases, to uncover any limitations we have for providing update functions in core, and to prepare core developers for considering upgrade path issues as we create the last few betas and first release candidates of Drupal 8. We need your help reviewing and communicating about this proposed policy, as well as identifying core issues that will be affected. Read the issue for more details.