I couldn't find any info about ElevenLabs V3 API support in VAPI or a timeline for when it might be available. Since this seems to be a specific roadmap or partnership question, I'm escalating it to a human on the team who can give you a more concrete answer.
In the meantime, if you're interested in the current ElevenLabs integration, you can check out the [VAPI ElevenLabs integration guide](
https://docs.vapi.ai/providers/voice/elevenlabs) and [custom voice setup](
https://docs.vapi.ai/customization/custom-voices/elevenlabs).