BetaNews has confirmed that Microsoft Office 2010 will be released in June of 2010. Microsoft Office Web Apps will likely be released at the same time.
64-bit vs 32-bit
Microsoft Office 2010 is the first release of Office that will be available in both 32-bit and 64-bit flavors. According to this article, Office 2010 will install the 32-bit version by default, even on x64 versions of Windows. For those of you installing Office 2010 beta, what are some of the reasons you are choosing to install the x64 bit version?
Will TechHit products support Office 2010?
Yes, absolutely! We have performed a preliminary round of testing of TechHit Outlook products with a beta version of Outlook 2010. The basic functionality works well with the 32-bit version of Outlook. Kudos to Microsoft for doing a good job on preserving API compatibility. We are planning on supporting 64-bit version as well as enhanced integration with the new-style UI. Follow this blog for news and beta version announcements.
Update: Both SimplyFile and TwInbox now have preliminary 64-bit support.

Is there a beta available?
Office 2010 beta is available here – http://www.microsoft.com/office/2010/
Really looking forward to your release of TwinBox for 64 bit outlook, will miss it in the meantime.