What is the status of this now? According to the documentation I am reading right now, it says that Unreal Engine 5 only supports .wav files, which tend to be several orders of magnitude larger than opus files.
Game file sizes have increased quite a lot since '14, it might be a good time to support formats with superior compression now that the average AAA game is over a tenth of a terabyte in disk space. While .wav will still be better for sounds that need to be fetched quickly like gun sound effects, .opus could provide some considerable savings for sound effects that can afford loading a bit slower, like music or voice acting files.
Apologies for reviving this thread, I just really wanted to know if anything has changed (or will change) since.