Microsoft Corp. today began distributing a half-million copies of the beta 2 version of the new Microsoft Office System to customers and partners worldwide. Companies and information workers interested in trying the Microsoft Office system can learn more at http://www.microsoft.com/office/preview/.

Source: Firingsquad (http://firingsquad.gamers.com/news/).

There's a great article here (http://www.pcmag.com/article2/0,4149,922433,00.asp) on some of the changes you will see in this next version of office.