The Beyond3D guys have been spending some time with the crew at Emergent Technologies; the folks responsible for the engine that runs Oblivion. They've posted a couple of articles on the Gamebryo engine: the first one is a primer, & the second is an interview with a couple of guys at Emergent. The primer covers Gamebryo's flexibility, some of its development tools, & what to expect performance-wise when developing on Gamebryo. The interview focuses more on the Gamebryo engine and its various tools and extensions, specifically Metrics Elements.

I'm personally wondering what exactly the B3D guys are up to... developing a new game on Gamebryo, perhaps?