The beta tools are now available and can be downloaded from here.
http://creators.xna.com/en-US/launchcenter
Orientation and Rotation
One of the new features in the XNA 4.0 for Windows Phone 7, is the ability to rotate a game without you having to code it up your self. Looks pretty cool, haven’t tried it out yet though.
http://blogs.msdn.com/b/shawnhar/archive/2010/07/12/orientation-and-rotation-on-windows-phone.aspx
Multitouch Behavior
Demo of multitouch on the Windows Phone 7 Beta emulator.
http://blog.galasoft.ch/archive/2010/07/12/multitouch-behavior-update-for-windows-phone-7-tools-beta.aspx
– Enjoy!