"Playback speed" refers to the rate at which audio or video content is played. It determines how fast or slow the content is delivered to the listener or viewer. Full definition
That being said, voice search, audio playback, album art, loading subtitles, adjusting playback speed and aspect ratio are currently up and running. (androidauthority.com)
For example, you can allow users to specify their preferred units of measurement or media playback speed. (howtogeek.com)
The latest version of Chrome for Android aims to address these matters by improving not only playback speed, but also power efficiency to ensure users get a better experience. (techtimes.com)