Microsoft SQL Server 2008 R2 SP1 - CTP is available for download, you can download it from,
http://www.microsoft.com/downloads/en/details.aspx?FamilyID=bd200f8e-ba8a-45e3-af59-e28a9e2d17df&displaylang=en
You can use these packages to upgrade any of the following SQL Server 2008 R2 editions:
1. SQL Server 2008 R2 Parallel Computing Edition
2. SQL Server 2008 R2 Datacenter Edition
3. SQL Server 2008 R2 Enterprise Edition and Developer Edition
4. SQL Server 2008 R2 Standard Edition
5. SQL Server 2008 R2 Web Edition
6. SQL Server 2008 R2 Workgroup Edition
7. SQL Server 2008 R2 Express Edition
The following New Features are Included in SQL Server 2008 R2 Service Pack 1,
* Dynamic Management Views for increased supportability
* ForceSeek for improved querying performance
* Data-tier Application Component Framework (DAC Fx) for improved database upgradest
* Disk space control for PowerPivot
http://www.microsoft.com/downloads/en/details.aspx?FamilyID=bd200f8e-ba8a-45e3-af59-e28a9e2d17df&displaylang=en
You can use these packages to upgrade any of the following SQL Server 2008 R2 editions:
1. SQL Server 2008 R2 Parallel Computing Edition
2. SQL Server 2008 R2 Datacenter Edition
3. SQL Server 2008 R2 Enterprise Edition and Developer Edition
4. SQL Server 2008 R2 Standard Edition
5. SQL Server 2008 R2 Web Edition
6. SQL Server 2008 R2 Workgroup Edition
7. SQL Server 2008 R2 Express Edition
The following New Features are Included in SQL Server 2008 R2 Service Pack 1,
* Dynamic Management Views for increased supportability
* ForceSeek for improved querying performance
* Data-tier Application Component Framework (DAC Fx) for improved database upgradest
* Disk space control for PowerPivot