With the Release of SCCM Configmgr 2012 SP1 RTM,When you deploy Secondary Site from its Parent site ,it will install SQL Server Express 2008 R2 Service Pack 1 (SP1) but as you can see from below snap (SQL server Requirements),the minimum required cumulative update is CU6 which you will have to install it manually.
Troubleshooting Client that has NO SCCM Agent in Console BUT still receive deployments
How to deploy SCCM Remote Control Bits (standalone) to clients without ConfigMgr Console being installed
How to use Configmgr Baseline to check server role or feature installed
SCCM Collection for active inactive computers using Last Logon timestamp and troubleshooting