Hardware model library is available to public, you should be able to access the HML from --> Hardware Model Libraries - CA Technologies (includes CA Capacity Command Center and CA Capacity Manager)
Hardware model library for Performance optimizer is accessible through Performance Optimizer Hardware Model Libraries - CA Technologies
Each hardware model library has a link to see the list of the New/Updated Hardware Models.
I believe this answers your question, let me know if it does not relevant..
Regards,
KS