Straight from Microsoft. I don't see anything in there that will shake the world. It's just a good solid list of evolutionary growth in the feature department.
The crash recovery feature is probably the most important. If you're going to start using web apps via your browser, you don't want to lose work if something goes wrong. This feature is directed toward that need and though details of how it is accomplished are not yet available, we are told it is fairly zoomy. There are several ways of going about this sort of thing and it will be interesting to see how MS chooses to do it because there is room for a better way.