As the Google blog says, "these features are just a fraction of what Google TV can do."
One hint, reported in the Wall Street Journal, is that "Linkages between Android phones and Google TV bring some unusual benefits. A Google engineer, for example, demonstrated how a person could use voice recognition in his cellphone to search for a TV program by speaking its name.
I see this as an opening for the kind of rich "Coactive TV" (CoTV) applications that coordinate TV viewing with enhancements and controls on a second screen device, such as an Android phone or tablet or notepad. While putting the Web onto the TV is desirable for some use cases, the real opportunity for convergence is to coordinate a Web device with a TV device. This can provide content and Social Web services on a Web device that knows what you are watching (such as to tweet about a program), and let the Web device control what you are watching) such as to swing a video from your tablet or phone to your TV.
Hopefully Google is well aware of this potential. I spoke to some senior people about these ideas some time ago (and as noted in a prior post, there is some interesting Google research, including a paper by some guy named "Brin, S"). But in any case, independent developers should be able to provide this (as long as the app police don't prevent them).
As noted in my previous post, iPad is beginning to show what a Webpad can do as a second screen. Google TV seems another big step in the right direction.