This is all very interesting. Really, I'm rather opposed to the school of thought that says, "Let's bung in 101 new features!" I would much rather see a Bryce 6 that had improvements to its core functionality rather than one that tried to do everything, and had a partial 3D modelling app bolted on as a result. For example, the atmospheric handling in Bryce 5 could be improved considerably, and I see this as a higher priority than putting in a spline modeller or some of the other suggestions above. The interface should be approached with care. As it stands, it is one of the best-designed interfaces I've ever used. I'm not saying it can't be made better, but it should be important not to lose any of the existing strengths.