Each version of this integration matches a specific build of Unreal Engine 4. Here is what has changed in the Unreal Engine 4.6 release of the integration (in addition to upgrading to the new Unreal build).

Unreal Engine 4.6 - Wwise v2014.1.1

• UI-183 Fixed: Use the debug SoundEngine libraries when UnrealBuildTool is configured to use the debug CRT libraries (bDebugBuildsActuallyUseDebugCRT = true).
• UI-184 Fixed: Added a billboard component to AkComponent to make them visible in the Editor.
• UI-186 Fixed: Allow drag & drop of .bnk files in the Content Browser to create UAkAudioBank assets.