SQLServerCentral published an article today that I wrote about SQL Server 2012’s execution plan parallel thread usage statistics:

SQL Server 2012’s Information on Parallel Thread Usage

The new thread statistics show information on the number of concurrent execution paths within an execution plan, the count of used threads and also the count of reserved threads per NUMA node.  Definitely a useful feature, giving you visibility to actual thread reservation and not just the number of concurrently executing workers.