Windows 2008 R2 RTM is announced for Week 29 Rire
 
main benefits:
 
ADDS improvements: new management console, 85+ cmdlets powershell
Powershell v2 and windows remoting
ADCS : new inter-forest support and new cryptographic providers
Core server: will support .net framework and IIS 7.5
Hyper-V v2 with live migration