There's a 2 week Whisper Fine Tuning event put on by Hugging Faces going on right now [1]. The new "large-v2" model was announced as part of the kickoff [2]. It's supposed to offer 5% - 10% improvements over the previous large model.

[1] https://discuss.huggingface.co/t/open-to-the-community-whisp... [2] https://youtu.be/fZMiD8sDzzg?t=1226