From the wiki:
Creating an infinite water source no longer needs a block underneath, but has to have a water source block.
This means you won't ruin rivers/oceans with Buckets
Made skeletons significantly harder to melee
Scales to difficulty
They now shoot faster when their target is closer
They shoot players one block away
Made zombies harder to shoot
Scales to difficulty
They now group up on targets
When on fire, they can now set players on fire
Now become aggressive and come towards you when shot from further away
Good lord, as if it isn't hard enough when you get started!!
Heaven help the lvl1 player hanging around the lvl 47 player LOL
Yeah, that'll make mobs more deadly, eh?
I like that getting water from rivers won't disturb the water anymore, though.
Agreed! Fixing water was always such a pain in the past