Have there been any hints that Apple may offer speech diarization services (speech recongnition which recognizes multiple speakers) in the near future?
Speech diarization
Hello @mjlee, thank you for your post. There's no supported way for you to recognize multiple speakers with the APIs currently available.
If you'd like us to consider adding the necessary functionality, please file an enhancement request using Feedback Assistant. Once you file the request, please post the FB number here.
If you're not familiar with how to file enhancement requests, take a look at Bug Reporting: How and Why?
Enhancement request filed with Apple: FB15558523 (Speaker diarization)