Hello,

Here are the Knowledgebase Articles available for SEP SBE 12.1.2015 (RU2) which would assist you to prepare for this Latest Release.

NOTE: This Article would be updated as and when new Articles in reference to SEP SBE 12.1.2015 (RU2) gets published.

Product Guides

Symantec™ Endpoint Protection, Symantec Endpoint Protection Small Business Edition, and Symantec Network Access Control 12.1.2 Release Notes

http://www.symantec.com/docs/DOC6155

Symantec™ Endpoint Protection Small Business Edition 12.1.2 Installation and Administration Guide

http://www.symantec.com/docs/DOC6151

Symantec™ Endpoint Protection Small Business Edition 12.1.2 Client Guide

http://www.symantec.com/docs/DOC6147

About Symantec Endpoint Protection Small Business Edition 12.1.2 product guide locations

http://www.symantec.com/docs/HOWTO81477

Installation and Getting Started.

System Requirements for Symantec Endpoint Protection, Enterprise and Small Business Editions, and Network Access Control 12.1.2

http://www.symantec.com/docs/TECH195325

What's new in Symantec Endpoint Protection Small Business Edition 12.1.2

http://www.symantec.com/docs/HOWTO81450

Symantec™ Endpoint Protection Small Business Edition 12.1.2 Getting Started Guide

http://www.symantec.com/docs/DOC6154

Supported upgrade paths for Symantec Endpoint Protection Manager

http://www.symantec.com/docs/HOWTO81442

Supported upgrade paths for the Symantec Endpoint Protection Small Business Edition client

http://www.symantec.com/docs/HOWTO81443

Upgrading to a new release of Symantec Endpoint Protection Small Business Edition

http://www.symantec.com/docs/HOWTO81258

Best practices for upgrading to Symantec Endpoint Protection 12.1.2

http://www.symantec.com/docs/TECH163700

Migrating from Symantec AntiVirus or Symantec Client Security to Symantec Endpoint Protection Small Business Edition 12.1 or later

http://www.symantec.com/docs/HOWTO81285

Creating exceptions for Symantec Endpoint Protection Small Business Edition

http://www.symantec.com/docs/HOWTO81364

About SONAR

http://www.symantec.com/docs/HOWTO81392

How to's

Preparing Windows operating systems for remote deployment

http://www.symantec.com/docs/HOWTO81300

Why do I need to replace the client-server communications file on the client computer?

http://www.symantec.com/docs/HOWTO81261

Restoring client-server communications by using a client installation package

http://www.symantec.com/docs/HOWTO81455

Managing the client-server connection

http://www.symantec.com/docs/HOWTO81337

Duplicate clients appear after upgrading the SEPM from 12.1 or 12.1 RU1 Small Business Edition to 12.1 RU2

http://www.symantec.com/docs/TECH196864

NOTE: You could also search on the Symantec Knowledgebase as well -

http://www.symantec.com/business/support/index?page=landing&key=55357&version=61945&sort=recent

Hope that helps!!