A powerpoint presentation from Google Analyst Day gives some insight into Google's strategy for the future, which, as you might expect, centers largely around having users store all their data on the Google network. The comments in the post at Greg Linden's blog have some interesting notes from the powerpoint presentation:
Theme 2: Store 100% of User Data
With infinite storage, we can house all user files, including: emails, web history, pictures, bookmarks, etc and make it accessible from anywhere (any device, any platform, etc).
We already have efforts in this direction in terms of GDrive, GDS, Lighthouse, but all of them face bandwidth and storage constraints today. For example: Firefox team is working on server side stored state but they want to store only URLs rather than complete web pages for storage reasons. This theme will help us make the client less important (thin client, thick server model) which suits our strength vis-a-vis Microsoft and is also of great value to the user.
As we move toward the "Store 100%" reality, the online copy of your data will become your Golden Copy and your local-machine copy serves more like a cache. An important implication of this theme is that we can make your online copy more secure than it would be on your own machine.
In another post Greg Linden asks what Lighthouse is, the answer to which still seems a bit uncertain. A commenter suggested it could be related to another information retrieval system by the same name [pdf].