Antimalware Engine 1.1.11602.0 was released to customers on 20 Apr 2015

Apologies for the late posting:

Antimalware Engine 1.1.11602.0 was released to all Windows Defender, Microsoft Security Essentials, Forefront Client Security, Forefront Endpoint Protection, Windows Intune Endpoint Protection, and System Center Endpoint Protection customers on 20 Apr 2015. Signature package 1.197.0.0 is the first that contains this engine.