Based on feedback from the community (https://connect.microsoft.com/SQLServer/feedback/details/522123/sql-server-2008-service-pack-2 and https://connect.microsoft.com/SQLServer/feedback/details/522122/service-pack-4-for-sql-server-2005), Microsoft has announced plans to release Service Pack 2 for SQL Server 2008 and Service Pack 4 for SQL Server 2005. The official announcement from the SQL Server Group Project Manager Matthias Berndt is here.
Here's the abbreviated version:
- Service Pack 2 for SQL Server 2008 is targeted for a Q3 release.
- Service Pack 4 for SQL Server 2005 is targeted for a Q4 release.
SP 4 is currently scheduled to be the final SP for 2005. The announcement also contains some info. about SQL 2005 going into extended support from April 2011 to April 2016.