As I mentioned previously - I'm continuing the KML 3 discussion and blog posts to the Mapufacture blog starting with KML Module: Services. Very soon Mapufacture will start implementing some of the proposed changes as a testbed for trying out the new KML formats and capabilities. When it's available, I'll blog about how to start playing with it.
So if you want to continue playing along, track on over to the Mapufacture blog, or just toss the RSS or Atom feed into your reader and you'll probably not notice the difference.