Kubuntu gets a new sponsor

What exactly does a Canonical support contract cover? It's clearly not everything in the Ubuntu main repository right? It some not easy to identify set of software that spans main and universe.. and now appearently a new cloud archive repository that sits outside of the standard Ubuntu QA processes that Canonical is offering for openstack users to keep up with openstack development beyond essex.

Does anyone have a good mental model..a good description of what is actually covered in a Canonical support contract for 12.04? Is there in documentation for drive-by potential customers that would help them get a firm idea of the software packages that are covered under Ubuntu Advantage? Or is it basically case by case support coverage? How does a potential customer know that kubuntu is not backed by Canonical commerical support prior to selecting kubuntu 12.04. Canonical's own Ubuntu Advantage overview doesn't really make any concrete statements about where the support boundary inside the Ubuntu "official packages" actually is.

The commercial support situation is very confusing and entirely opaque.

-jef