Although it's still having trouble getting people to move from Office 2003 to Office 2007, Microsoft said a week ago at the TechEd conference that it would launch an invitation-only Technical Preview Program of the new Office in July. Never let that sort of thing stop BitTorrent downloaders, apparently.
Leaked copies of the Technical Preview have reached P2P networks. Although the first information I received on this were from one site
and one set of torrent links (remember that Office 2010 will come in 32-bit and 64-bit flavors), its hit more reputable (we know, we know, the RIAA would laugh over this nomenclature) sites such as Mininova
Of course, any downloading of this software is at your own risk, and not just legal risk. Recently, some Windows 7 RC images which were leaked prior to public availability were infected with malware.
ZDNet has a slideshow of screenshots if you want to just look, not touch, here