There are a few dozen more free themes in the pipeline, but the first group is done, demoing, and downloadable. The next group will include Tikipedia, which is the Wikipedia look-alike for Tiki sites, and others.
I'm hoping the themes' installation and setup goes ok for people; I'm working on a more systematic approach to theme docs. Actually it would be good to use Tiki Profiles to facilitate theme installation - really, that's the kind of thing the feature is made for. So I'll try supplementing the docs with profiles soon.