Well being a huge D1-D2 fan,
1.I hope they would extend the story line much longer,
2.new character ~like they did so far~ ~grats~!
3.bigger scarier monster, better boss fights, maybe harder too.
3a. maybe some mini bosses during some levels.
4.Better music, ~I love all the other music from D1-D2~ (Def add Tristam music ;D)
5. Def bigger cap in a game, (8 is nice) but mabey like 10-12, would be even better.
6.More skills like they all rdy have ~grats~!
7.Def MORE RUNE WORDS
8.boy/girl characters for every class
9. And if there going to do (acts) like they will because it Diablo (PUT MORE QUESTS IN A ACT)