How do you know? HP owns a stable of main frame class operating systems now: openVMS, Tandem Himalaya, Ultrix, the HP version of Unix (whatever that was). They are capable of cranking out something a little more substantial than BSD.
And I'm pretty sure that system isn't running VMS. ;)
I hope they bring back MPE-V.
I want to kill print jobs again by using the 'deletespoolfile' command again.
Sadly, there are some features of the MPE JCL that I still miss.