Each version of this integration matches a specific build of Unreal Engine 4. Here is what has changed in the Unreal Engine June 2013 release of the integration (in addition to upgrading to the new Unreal build).

June 2013 - Wwise v2013.1.1

• Added DebugGame build configuration support.
• Partial Wwise SDK now included to help setting up the integration.
• Fixed xaudio2/mmdev DLL unload issues in Windows 64-bit build.
• Stopped matinee movie from playing in demomap - was preventing user input from working.
• Fixed AkAudioDevice listener position update in FLevelEditorViewportClient::UpdateAudioListener.
• Changed the AudioDeviceModuleName default value to XAudio2 on the windows platform.