Nearly all of you are REALLY expecting too much ... I am not an optimist, but also I am not a pessimist. So in my opinion realistic DLC is:

- 1 or 2 game-updates for balancing-issues and other small bug-fixes that further maybe include 1 or 2 new game-modes
- 1 or 2 Map-Packs for Halo Wars (similar price and content like the Halo 3-Map-Packs)

That's it. And yes, this would be okay. There already were some hints for bigger DLC, but I am not expecting something really big. The most awesome thing they could bring us for DLC is a Map-Editor - but as I said before, no one should ever expect that.