In addition to bug fixes, the following enhancement or change is provided in OES 11 SP3:
Upgrade from OES 11 SP3 to OES 2015 SP1 can be done remotely using zypper command. For more information, see Manual Upgrade from OES 11 SP3 to OES 2015 SP1 Using Zypper in OES 11 SP3: Installation Guide.