Sysprep has been a useful tool to allow the preconfiguration of SQL Server environments, along with the rest of the operating system. This can be very useful for templated Azure VMs as well as for on-premises systems and private clouds.
One of the limitations has been that not all SQL Server components were "sysprep-able".
Another important change in CU2 for SQL Server 2012 SP1 is that more SQL Server components are now able to be "sysprepped". In particular, SQL Server Analysis Services (SSAS) and SQL Server Integration Services (SSIS) can now be part of this.
This is good news and you'll find more info in the VM Engineering team's blog post by Robert Hutchison here: http://blogs.technet.com/b/scvmm/archive/2013/01/25/expanded-sysprep-support-in-sql-server-2012-sp1-cu2.aspx