JODConverter, the Java OpenDocument Converter, converts documents between different office formats.
It leverages OpenOffice.org, which provides arguably the best import/export filters for OpenDocument and Microsoft Office formats available today.
If you think Windows 8 is just a change in GUI, you're already behind in the future of computing and GUI's. This article talks about the future of the computer and GUI's. Very interesting read.
In this blog post by a Microsoft developer, there are examples of scrolling on a single webpage by moving left to right (vs. scrolling up and down). Also, some main navigational buttons and menus are now on the RIGHT side of the layout instead of the long-used left side of the layout location for these elements.
I believe this is an example of the influence of touch screens on tablets, phones, and computers affecting the long held paradigm of left side menu navigation. The gesture navigation of touch screens is making another mark on design and layouts.