There are two statements in the Q&A to that topic:
Q.
Which ASA platforms will support ASA CX?
A. Initially, ASA CX will be delivered as a hardware module on the Cisco ASA 5585-X security appliance. At FCS, ASA CX will be supported on the ASA 5585-10 and ASA 5585-20. In the near-term future, a software version of ASA CX will be released, which will be supported on the newly released ASA 5500-X Series of next-generation midrange security appliances.
Q.
Does ASA CX support IPS functionality?
A. Not at FCS. IPS capabilities will be embedded into ASA CX in a near-term future release.
Taken from http://www.cisco.com/en/US/partner/prod/collateral/vpndevc/ps6032/ps6094/ps6120/qa_c67-700607_ps12521_Products_Q_and_A_Item.html
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