Horde3D

any chance to see it in action? just a few more screenshots please (maybe a video, or if you feel generous; a binary )

Did I miss something? What Aerosion Demo are you talking about?

The pyropix screenshot taken before Horde existed

Ahhh, Then Nicolas has to answer the question.

The project is nearly three years untouched now. We had a working demo but it was far from being polished so we decided not to release it. Unfortunately many team members had no time any more so we had to stop the project. Horde3D is a heavily improved version of the Aerosion engine (which was called yak3d )

http://www.pyropix.net/aerosion.htm
here I should have googled

And what about the "Orchestral soundtrack and additional rocktracks"...?
Downloadable anywhere?

We had a soundtrack that was specifically composed for the project and one track was recorded by an orchestra. But due to time constraints of several of our team members we had to stop the project, that's why there is no downloadable version.