I'd suggest starting with a general overview (status, roadmap), discuss open points and what we can work on during the sprint.

Possible points for discussion:
* Combined Field&Entity API Storage
* Entity Property API

Please add further points you'd like to discuss in the comments and join the sprint:
http://groups.drupal.org/node/210563

See the related forum post:
http://denver2012.drupal.org/forum/drupal-8-entity-api-bof

Also check the related BOF specifally for entity property translations:
http://denver2012.drupal.org/forum/drupal-8-entity-property-translation-bof