Support for Virtex-5 devices has been removed and is reflected in the v2.3 core available in the 13.2 ISE Design Suite.
Information on supported devices, features and limitations can be found in the Features and Product Specification sections of the DisplayPort Product Guide PG064, available on Xilinx.com:
If you have any questions, please contact Xilinx Technical Support:
12/03/2012 - Minor update; added information on where to find device support
08/22/2011 - Initial release