It appears Google and YouTube are starting to put in something new – automated captioning. This will help a lot for people who are unable to receive the audio for either physical or mechanical reasons. It’s going to start with English only, but they will be using voice recognition software to turn the audio into legible captions.
There is word that this update may affect SEO, but I have my curiosities about this. It can only truly affect SEO if the captions are somehow written into the page code. We can only see if this is the case once this new development in YouTube goes live. We’ll see how it turns out.