I see there is some package called MPSP is appeared in the Premier Downloads and Announcements section on Intel Busyness Portal. Where we can read more about the package and how it is related to MPSS?
They are not generally available and are not related to MPSS at all. But if you have access to Intel Premier Support, the information about it is included in the tarball.
The latest Intel Xeon Phi Processor software (1.4) is posted here: https://software.intel.com/en-us/articles/xeon-phi-software . It currently supports Centos 7.2, RHEL 7.2, SuSE 12.0 and SuSE 12.1 and Windows*.