Minecraft wiki entry for Development_versions, associated text: All waves have now been rebalanced, with certain waves focusing on certain mobs, and early waves becoming less easy.
Now follow a set pattern of waves based on difficulty (Easy is three waves, Normal is five waves, and Hard is seven waves).
A bonus wave is added for every additional level of Bad Omen brought into a village, equivalent to the final base wave.
Higher level of Bad Omen means higher chance that enemies will have enchanted weapons.
Raids now end with a Victory or Defeat message.