Hello,
Symantec Endpoint Protection 12.1 Release Update 2 Maintenance Patch 1 (SEP 12.1 RU2 MP1) is in the process of being made available now. I understand that it should be available for general download early next week.
There will also be a Symantec Endpoint Protection 12.1 Release Update 3 which will follow within a couple months.
(usual disclaimer: any schedule can change...)
Hope this helps! &: )