Each version of this integration matches a specific build of Unreal Engine 4. Here is what has changed in the Unreal Engine 4.8 release of the integration (in addition to upgrading to the new Unreal build).

Unreal Engine 4.8 - Wwise v2015.1

• Migrated the UE4.8 integration to Wwise 2015.1
• Fixed a crash on Xbox One if the app manifest did not contain a definition for Wwise communication ports.