True. I'd say if you have a good news navigation menu at desktopdungeons.net, you could post everything there.
At the moment, all "public" stuff is posted there while all the "behind the scenes" stuff is posted on QCF. So there are two options:
1. Post all on desktopdungeons.net, but also have a good navigation menu, so you can filter the news blog posts by subject (Behind the Scenes is another subject than game reviews). Then keep QCF for other games and company-related news.
2. Have desktopdungeons as a static site, without any news posts. There may be game info, images, videos which may be updated once in a while (just ignore the static part then), but no news.
A good example of the first option may be Blizzard's World of Warcraft
A good example of the second option is the website from the survival horror game Amnesia: The Dark Descent
While there are still news posts at Amnesia's site (look at the bottom left), they are all links to frictionalgames's site news pages, the company's site. (Like we have QCFDesign here, where all news updates are) Other than that, the site won't change other than the one image or video update once in a while, or when they release a serious update (like an expansion).
Just some food for thought...