New PureFlex System features include the following:

• 64 GB memory feature and Fibre Channel and Ethernet adapters on select IBM Flex System compute nodes
• IBM Flex System Fabric CN4093 10 Gb converged scalable switch, IBM  Flex System Fabric EN4093R 10 Gb scalable switch, and switch upgrades on the IBM Flex System Enterprise Chassis
• Front door for the IBM PureFlex System 42U Rack
• Expansion Indicator Codes and Content Specify Codes

Find more information here.