For starters, Google already knows much about you --- who and where you are, who are your connections and what are your core interests, even though it's not always apparent how we're disclosing them.
Now it will start attaching that information to tools that will try to prove relevance. In particular it will be working with Google Social Search for greater comprehension of networking and Latitude features for stronger understanding of where your friends are on that network.
Google also plans greater collaboration with interoperable networks and devices. It ought to be an interesting push beyond Nexus One.