Earlier today Microsoft has announced the availability of the public preview of the next Office products version (Office Client, SharePoint, Lync, Exchange).
Many great improvements on both server and client side
Public preview is available for download at http://www.microsoft.com/office/preview/ and from MSDN/TechNet/Premier website
Enjoy
More information and demo will come at the Office On Air (French) blog http://www.blogoffice.fr/