Hmm suggestions for DD2... some of these will probably be repeats since I don't feel like reading all the replies

1. Martial Arts/Hand to Hand (bare fist or hand weapons)
2. Dual-wield
3. Katanas... Asian weaponry...
4. The option of using your DD1 character like going from Baldur's Gate 1 to
Baldur's Gate 2
5. Selectable character features... hair color, skin color, etc...
6. Multiple races.
7. Mounts... horses... drakes...
8. As there has been said Hirelings... and if there's mulitplayer... options for player made guilds... maybe a building editor....
9. Craft skills... weapon smithing, armorsmithing, fishing, hunting, trapping, brewing, tailoring, enchanting...
10. Seafaring. Deep Underground Adventure. Cities in the Sky...
11. Familiars.
12. Renaming of equipment.