RDP 7.0 coming to XP and Vista
http://blogs.msdn.com/rds/archive/2009/08/21/remote-desktop-connection-7-for-windows-7-windows-xp-windows-vista.aspx
I think this will be a win for Microsoft. W7 is a very strong product and this a demonstration of its increased functions. Vista back porting was for a different reason, MSTSC 6.1 was mainly for security, not features or usability.