I believe the question it not quite what we want ... since we all know deep down that we want everything. :-/
But what we are willing to do without ...
For me i could imagine DLC that dont contain any new Races, or Classes and yet it might be at least interesting ...
On the other hand i cant quite imagine myself buying DLC that dont contain any story, or additional zones ...
So in conclusion ...
The more we get, the more reasons to buy it ... as long as it keeps things interesting.
And there is one more thing i wish to say ... in matter of DLCs, if Larian ever decide to create some, for Gods sake, please dont add there any gamebreaking overpowered items. -_-
There is nothing stupider and lazyer than if rusty broken sword from DLC have double stats than best sword from base game. :-/
Mm, wouldn't want them to add something that is essentially buy this dlc to beat the game easily, though maybe the DLC should be scaled to whatever level it is supposed to be done at, so say the DLC is intended to be level 12 there could be +3 stuff there BUT due to how high of a level it is, it would be damn hard for a low level character to get that stuff without ballsy creativity and luck, which would probably mean that they could have done any encounter without a +3 weapon.