Minecraft wiki entry for Development_versions, associated text: MC-32663 – Some shaders render entire screen black
MC-32672 – /testfor command no longer works.
MC-32673 – Command Blocks ignore Gamerule "commandBlockOutput".
MC-32687 – Activating Minecart with Command Block with an Activator Rail causes multiple activations.
MC-32699 – Squid damage multiplayer - End of Stream, NullPointerException.