5 new characters Amazon,
Necromancer, Paladin, Barbarian and sorceress, each of the new
character class will have its own, new special spells and
abilities.
4 complete different towns, and each town is up to 8 times
larger then Tristram .
A lot of dungeons, caverns and crypts in every town for
players to explore.
New quests, weapons, spells, armor, monsters and
non-player characters which you can hire to fight among your
side. The mercenaries cost about 500 gold per day.
A new combat system which includes class-specific fighting
techniques and spells.
Over 20 new quests.
Single player quests will also be available in multiplayer
play.
A run feature will be added.
Over 30 new villagers and other non-player characters to
communicate.
True transparencies rather than dithered.
More multiplayers supported ( 8, In Diablo only 4 ).
More realistic lighting and shadowing effects, and no
loading times when warping to a new level.
Warrior classes will not be able to learn spells or use
staves.
Day and night will cycle to make the atmosphere a lot
cooler.
A complete new system on battle.net that will make it
difficult to cheat.
Difficulty levels will be taken out of the game, because
the further you come, the more difficult the game will be.