Each version of this integration matches a specific build of Unreal Engine 4. Here is what has changed in the Unreal Engine July 2014 release of the integration (in addition to upgrading to the new Unreal build).

July 2014 - Wwise v2013.2.9

• Added a SwitchDemo map to the UnrealWwiseDemo sample game, demonstrating the use of switches.
• UI-161 Fixed: Removed the duplicate AkComponent created when starting an ambient sound. This prevented the Stop Ambient Sound method from working.