12.1.2 guides have been posted for those of you wanting an early look at what's new. See these links:
Symantec™ Endpoint Protection and Symantec Network Access Control 12.1.2 Installation and Administration Guide
https://www.symantec.com/business/support/index?page=content&id=DOC6153
Symantec™ Endpoint Protection and Symantec Network Access Control 12.1.2 Client Guide
https://www.symantec.com/business/support/index?page=content&id=DOC3719