Well we certainly don't want Google to go afowl of the law in the future, now do we? I am confident that Google will not create a browser-based operating system where the browser is claimed to be intergrated into its systems like Microsoft has.

So what will my options be in Google Chrome OS, and will changing the default browser be apparent?

Whatever software it is, make sure it works anywhere they go: on the bus, in the yard, at Church, at the mall, etc.

"No matter where you live, no matter who you are, no matter how wealthy you happen to be, this is a good idea."

I like it.
Just don't forget to drill for oil here and now and get it out to market quickly, so we will not have to pay so much for it as we get to the carbon-neutral point of Nirvana.