Already in Denver there where a lot of great discussions about the future of the Entity system in Drupal and what the directions are. Now, in Barcelona, things settled down a bit and the Entity API team is about to push the new architecture into core in a first iteration.In this document i’ll investigate the expected resulting architecture, compare it to the current Drupal 7 core + contrib needs and evaluate further ways to go to either make core support the needed things or allow contrib to add support for it without too much pain.