Server-side card production was revised with this release to overcome a couple of limitations in the old implementation.
Specifically, the task serverSideProductionPreviewTask.jsp was removed and service tasks for server-side production were changed. This means, custom processes using this feature need to be adapted accordingly.
Contact Nexus for further details, if you are using this feature.
All standard processes and custom processes using client-side card production, which is the default approach, will not be affected and can be used with PRIME 3.8 without any changes.