According to the very latest, Space Marines will get an updated codex this summer. The rest of the timeline that Lord of War Gaming is predicting has mention of Raven Guard, Eldar, Tau and Admech.
Please remember that these are rumors.
via Lords of War Gaming
-Lords of War Gaming Raven guard vs Tau and should be out before Tau release.
-Don't know about a Raven Guard supplement but Adeptus Astartes: Space Marines will release this summer.
-Lords of War Gaming Yes. After Admech it will be codex Craftworld: Eldar. Plastic jetbikes and Artach.