While we are still waiting on the release of Unigine Heaven for Linux, the Unigine Corp developers continue advancing this multi-platform game engine. The latest code being worked on for this engine adds support for physical cloth along with physical wind that impacts physical cloth areas. There's also been some other changes too, but their newest feature is for the physical cloth. Unigine Corp has also provided a few videos showing off the new effects.
This revision of the Unigine engine won't be found in the Unigine Heaven demo, so we will just need to wait and see what Unigine Corp or its partners release in 2010.