Cisco just added the Compute work center and UCS support in PI 2.2. I suspect they used the C220 as a first target since that's the platform for the upcoming hardware appliance refresh.
While they haven't announced future release plans, typically we see incremental device updates via the update packages - those have been coming out almost monthly with PI 2.1.
I'd encourage you to submit enhancement requests via your Cisco account team if the feature is important to you. Customer feedback is one of the key elements in deciding what features the developers focus on.