Cherwell is to replace HPSC for Support tickets, change management, etc.

Audio conference 5 August 2014 with Sean Armstrong and Kevin Jacobson:
Cherwell supports SAML authentication.
Cherwell can provision internal accounts 'on the fly' from attributes in SAML assertion.

https://cherwellsupport.com/webhelp/CSM_Webhelp_4.3_EN/index.htm#5379.htm

describes integration for institution-based authentication using SAML with explicit reference to Shibboleth.

Kevin Jacobson is primary vendor contact.