Each version of this integration matches a specific build of Unreal Engine 4. Here is what has changed in the Unreal Engine 4.11 release of the integration (in addition to upgrading to the new Unreal build).

Migrating from the UE4 Wwise integration source code to the plug-in version

Unreal Engine 4.11 - Wwise 2015.1.6

• The Wwise Unreal integration is now a plug-in. Please see migrating411_to_plugin for migration notes.
• UI-273 Fixed: Create a new uasset type for Auxiliary Busses. This allows to assign an AuxBus to a SoundBank. See AkAuxBus for more information.
• UI-280 Fixed: Deprecated "...by name" methods, and replaced then with a string field in the relevant methods. See Migrating "...by name" methods for more information.
• UI-309 Fixed: Made the Wwise project path relative to the game folder, instead of relative to the UE4Editor.exe file. See Migrating the Wwise project path for more information.