Google is known for being secretive on projects they are working on. In the past, people had to rely on word of mouth to find out snippets of information on new ideas and products.
If you want to find out what new stuff Google is working on, you can now visit http://www.google.com/newproducts.
This site consolidates information that was provided in the different Google blogs into one location. You now can subscribe to one RRS feed instead of many in the past.