You can sign up now for the Office 2010 Technical Preview release in July here. If you’re attending TechEd this week – you’ve already received info on the release (if not, look for someone at the Office booth for details).
What’s new in Office 2010. Read it here on the Office 2010 team blog.
Here’s what I can tell you:
1. Office 2010 will be available in both 32-bit and 64-bit versions.
2. Office 2010 will run on Windows XP SP3, Windows Vista, and Windows 7.
3. You don't need to replace hardware that is capable of running 2007, it will support Office 2010. Like Windows 7 has demonstrated, we realize that taking advantage of the hardware you already own is just as important as supporting all the new technology coming out.
There’s an interesting comment from TechEd about Groove on the Office 2010 twitter feed.