The spells have been changed to be more powerful: the spell charging takes less time (1-2 seconds), and the spell effects are smaller and take more damage, so that they lag less and are more effective. More spells use spell charging animations and nicer spell effects.
Monsters use more spells: they also fire fireballs and icestorms instead of just magic bullets, so keep care when going into the level 4/5 treasure caves!
Soon the summoning spells will be enabled, giving sorcerers and priests more ways to fight back the barbarian hordes...