I did find some demo songs by accident while looking at version download pages and they are there at bottom for various versions of Cubase. I still think it would be a great idea to have a few load on Hub page at install, and a specific tab for more would be great also.
Have also found lots more video and tutorials since this post, but again, still think it would be great to have lots more official Steinberg ones added to the Hub and version specific or applicable ones made more avail to end user. Easier is better.
My own update, loving AI 9 enough to reload my Artist 8.5, and bought Halion Symphonic Orchestra to sweeten the experience and possibilities. Now considering upgrading to Artist 9 for a few additional features eventually.