Changed the idea of mob difficulty
Regional difficulty: The longer you spend in one area, the harder it gets
Scales with difficulty - items, enchants or AI improve with difficulty
Yeah. I don't like the first part. Unless your house doesn't fall under that, that's pretty rediculous.
Oh and then there's this part of the version history that I hate with a passion:
Natural health regeneration now costs hunger points/saturation points
I'm not happy about that. So if I want to regenerate in combat I have to stuff my face? No thank you.