Among the new features that are referenced by the Google Docs' code, the most important seems to be the integration with online knowledge bases. Google Docs will let you access Merriam-Webster's dictionary and thesaurus directly from a document. You'll also be able to read articles from Encyclopedia Britannica. It's rather curious that Google didn't opt for everyone's favorite encyclopedia, Wikipedia, and choose the oldest English-language encyclopedia still in print, but also an encyclopedia hard to access online for free. Britannica has an odd policy of allowing you to read an article for free only if you place a link to the article in a web page and click on that link.
Google Docs should make use of more online resources and let you integrate information from search results, translate text or use Google's statistical data about languages to correct grammatical errors or reformulate incomprehensible text.