Feb CTP Builds for SQL Server 2005 are out ...
Can check on the Express Manager version detials here:
SQL Server 2005 Express Edition - Community Technology Preview February 2005
SQL Server 2005 Express Manager - Community Technology Preview February 2005
This is an interim build and includes 64-bit support for SQL Server Reporting Services and SQL Server Notification Services, upgrade support from SQL Server 2000 to SQL Server 2005, and new SQL Server Reporting Services features including Report Builder and a new server configuration tool. You can download the complete CTP build from the MSDN Subscribers Downloads.