In another thread we discussed the wish lists for GalCiv III.
update schedule is:
v1.1: Early July (would have been this month except for the Steam sale and E3)
v1.2: August (looking at random events and more UI polish, AI updates, etc.)
v1.3: September (looking at politics and diplomacy, plus more UI, large empire automation, etc.)
v1.4: October (battle system focus, AI, etc.)
v1.5: November (TBD)
Each of these updates will also make available DLC.
The first DLC will be the map pack and map editor
But beyond that, what would you like? These would be $4.99 DLC. DLC generally doesn't have any new code in it, just content (art, XML, etc.).
Let us know what you'd like!