the things i've seen so far is the monsters who changed places and of course skill interaction. Difficulty has also gone up,
try walking around in worldstone keep hell

also the drops are better too, got a arreats face and gaze from baal on hell first time i killed him, and a unique hyperion spear from 1 of his minions, ariocons needle or something like that.

i think these are very good changes and will make ladder in a party certainly worth playing again

what do u think after playing the beta ?