Microsoft just released Beta 1 of Office 12 on Betaplace:

Microsoft Office “12” Professional, Beta-1 build
Microsoft Office “12” FrontPage, Beta-1 buildMicrosoft Office “12” Groove, Beta-1 build
Microsoft Office “12” Groove Management Services, Beta-1 build
Microsoft Office “12” Groove Data Bridge, Beta-1 build
Microsoft Office “12” Groove Relay Server, Beta-1 build
Microsoft Office “12” OneNote, Beta-1 build
Microsoft Office “12” Project Professional, Beta-1 build
Microsoft Office “12” Visio Professional, Beta-1 build
Microsoft Office “12” InterConnect, Beta-1 build
Microsoft Office “12” Business Contact Manager, Beta-1 build
Microsoft Office “12” Windows SharePoint Services, Beta-1 build
Microsoft Office “12” Server, Beta-1 build
Microsoft Visual Studio Tools plug-in for Microsoft Office “12”  InfoPath
Microsoft Office “12” Open XML File Format Compatibility Pack

Update: MS Press Release

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