You would not know from reading Version history, but the feature is available in the current Kindle apps for iOS/macOS and Android (in Aa|More options). (Subject to DRM restrictions of course)
It supports multiple languages (at least English, French, and Spanish, but not Russian), and the voice data seems to be part of app resources, as there is no visible way to choose or download or remove voices.
I noticed the new terminology and implementation (highlights text, and speed can be adjusted by 0.1x increments) on FireOS Kindle app a couple of weeks ago; for all I know it was already there also for the other platforms.
It supports multiple languages (at least English, French, and Spanish, but not Russian), and the voice data seems to be part of app resources, as there is no visible way to choose or download or remove voices.
I noticed the new terminology and implementation (highlights text, and speed can be adjusted by 0.1x increments) on FireOS Kindle app a couple of weeks ago; for all I know it was already there also for the other platforms.
