The build which has been leaked last week is said to install with the Office 2010 Technical Preview keys and no new keys are needed. So the keys are available here.
Here are some very exclusive screen shots running the Microsoft Office 2010 on my Win 7 RC 1 as you can very well see the UI has been polished and so also the program icons. The public beta is expected to be out by early next week.
Office 2010 runs on Windows XP SP3, Windows Vista and of course the brand new Windows 7.
Here are the exclusive Screenshots of Office 2010 Beta 2 (Build version 14.0.4514.1007)