Base on the Google products (Chrome Browser, Gmail, Docs, Excel, Calender and etc..) we can do a wild guess that how Chrome OS going to be. I would like to see a OS like this.
There will be Files but not Folders - Folders will be replaced by labels that will give more flexibility over the managing your files and quicker search.
Do you really need a start button but a search enabled (drop down menu with options) command line will be there.
Interface will be quite similar to Google Chrome web browser that will give much power on connecting to web applications faster and securely. Chrome browser is not supporting Ad-ons and tool bars. We can hope that Chrome OS would be pretty much same that it would not support many of the applications we use today.
Offline and Online versions will be available for all the applications. So you will be able to do changes updates and stuff in your documents and when you connect to Internet it will be sync with the servers (Google server).
Files sharing would be across Internet. Just like in Google Docs. Between the computers it would be base on the invitations. So, you do not really need to worry about the IP address network settings and so on.
Connecting to the Internet should be really easy. Should be able to do the configurations by it self. Only the user name and password for the router or modem would be required.
One of the dream and cool feature would be to have two levels of log in. One to log into the local machine. Another just like you log into Google Account (Online). When you log into the local machine it will have all the offline content for that account and when you log into the online account it will add all the account settings to the offline version... In that way you will get to see the same files and settings from any computer that is connect to Internet. Remote computer is not that user friendly.
And will there be Google AdSense Ads on Google Chrome OS? That would be interesting to know.
What else or how you would like to get Google Chrome OS?