Yes, all these documents are now publicly available.
Title: Upgrading or migrating to Symantec Endpoint Protection 12.1.4 (RU4)
Document ID: TECH211821
Article URL: http://www.symantec.com/docs/TECH211821
Title: New fixes and features in Symantec Endpoint Protection 12.1.4
Document ID: TECH211972
Article URL: http://www.symantec.com/docs/TECH211972
Title: Symantec Endpoint Protection, Symantec Endpoint Protection Small Business Edition, and Symantec Network Access Control 12.1.4 Release Notes/What’s New
Document ID: DOC6838
Article URL: http://www.symantec.com/docs/DOC6838
Title: System Requirements for Symantec Endpoint Protection, Enterprise and Small Business Editions, and Network Access Control 12.1.4
Document ID: TECH212063
Article URL: http://www.symantec.com/docs/TECH212063