These appliances have been replaced with McAfee SIEM Generation 5 Hardware, which is currently available for sale.
McAfee recommends that all customers with McAfee SIEM Generation 4 Hardware appliances consider migrating to a supported solution before the EOL date to maintain support and take advantage of the latest product enhancements.
See KB89325 for specific details about each hardware appliance that is affected by this announcement. (https://kc.mcafee.com/corporate/index?page=content&id=KB89325)
The EOL product list and policy is available at: http://mcafee.com/us/support/support-eol.aspx