Seems as of late that plans for voice chat API are on the backburner, due to the absence of related announcements. I’ve searched around and can’t find any new API features at the time of writing this.
Pages I've looked through:
Roblox Platform High-Level Roadmap
Immersion is a crucial aspect of voice chat which tends to be overlooked. However experiences can’t be fine-tuned for optimal immersion without extensive voicechat API.
A use-case I wanted to implement just now was stealth gameplay involving hostile NPC tracking the playbackloudness of individuals utilizing voicechat and the NPC reacting upon certain loudness thresholds being exceeded, but there’s no API to leverage.
Aside from that practical example, I can imagine the absence of extensive voice chat API drastically limiting the development of other new player content on the platform, either in the form of games, features or/and minigames built around voicechat.