The 3.0(1)S4 version of the sensor was released last week and placed on CCO.
You can download an upgrade from 2.5 to 3.0 from here if you have a service contract:
http://www.cisco.com/kobayashi/sw-center/ciscosecure/ids.shtml
You can download the release notes and user docs from here:
http://www.cisco.com/univercd/cc/td/doc/product/iaabu/csids/csids6/index.htm
Marketing is still preparing the official notice, but customers can go ahead and download and begin running the new version.
NOTE: The new sensor version will require that CSPM be upgraded to 2.3.1i and the Unix Director be upgraded to 2.2.2a. The older CSPM and Unix Director versions can not send configuration files to the new sensor version.
