Each version of this integration matches a specific build of Unreal Engine 4. Here is what has changed between the 2017.1.2.6361.696 and the 2017.1.3.6377.715 release of the integration (in addition to upgrading to the new Unreal build).

Unreal Engine 4.15/4.16/4.17 - Wwise 2017.1.3.6377.715

• WG-34797 Undoing a surface deletion on a Spatial Audio Volume properly refreshes its details panel.
• WG-34810 Late Reverb Component properties are now properly serialized.
• WG-34878, WG-34906 Sounds are now properly spatialized in a Play in Editor session.
• WG-34907 Performance improvement for FAkAudioDevice::Get().