The thing that Ubik was trying to showcase was not any of these (directly), but a more fundamental design change called Set facets. Set facets are an alternative to UseMod:SubPages and SectionedPageÿ?0ÿ, and provide a nice foundation for most of the features listed above. They are also, limited experience suggests, incredibly prone to micro-management, and hence evil. Ubik is thus currently deprecated by its owner, ChrisPurcell; if you want to obtain the engine, feel free to get in touch with him.
The name is still just fab, though.
UbikWiki was a spike of the FacetWiki project. You won't find it there any more. Check out that page for more recent directions the project has taken.