Stores have been tweaked a bit. Chests have been tweaked a bit. Paladins get a melee bonus vs. undead and demons. The random number generator has been replaced with a different one. Mana calculations have been tweaked a bit.
Rogues are slightly better at magic.
Teleport effects have been tweaked a bit. Meteor Swarm has been fixed. Mana restoration is less abusive. Some Mage spells have been tweaked a bit. Some monsters have been tweaked a bit.