If you use Chrome browser I suspect you get a get a idea of what it would be like to run Chrome OS if you goto "chrome://extensions/" and then follow the provided 'Get More extensions' link to the Chrome Web Store.
I was bit to surprised to find the Chrome Web app store by accident. I never seen it really advertised anywhere.
There are quite a few games and other things there, but games are mostly flash stuff.
use that for a while and maybe it will give you a idea on how they plan on promoting Chrome OS. I certainly don't.