SEGA issued the following statement to Eurogamer saying that they are moving on from supporting Dawn of War 3 due to disappointing sales, and there will be no further content for the real-time strategy sequel:

While Dawn of War 3 has a dedicated player base, it didn't hit the targets we were expecting at launch, and it hasn't performed the way we had hoped since. It's been tough for us as professionals who want to make great games for our players, and for us as people who care a lot about what we do.

When a game underperforms, plans need to change. With Dawn of War 3, we simply don't have the foundation we need to produce major content. We're working in close partnership with Sega and Games Workshop to determine the best course of action, while shifting focus to other projects within our portfolio.