On the new ASA 5512X series firewall the IPS module is built in to the firewall.  When you first start configuring the firewall the IPS module does not load.  To load the module so it starts up and you can configure it you must enter the following commands:

ASA(config)#sw-module module ips recover configure image disk0:"file name"

Then:

ASA(config)#sw-module module ips recover boot

The IPS module should then boot and you can check the status of it by entering the command:

ASA#show module ips details

Hope this helps!