I would guess there will be more dialog in D2:ED than DD, especially considering the multiple quest paths, etc.
Lar stated previously that the conversation tree is so elaborate that adding significant differences for male and female characters would have been impractical. Talking about preparing to do the voice recordings, he mentioned an excel file containing around 131000 fields of data (Some of those fields would probably have to be reference numbers, though, and it was not mentioned how much dialog there was per field).
I'd be surprised if they didn't keep the same humour in the dialog (and easter eggs, some of the side quests, etc).
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