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Not sure how much this will affect the signal-to-noise ratio in the comments section, but it is interesting.
To find the the new preview, click on "Post a Text Comment" and the "Audio Preview" button is the first one on the left.
BTW, I'm not sure if this was just a coincidence, but a week or so ago the popular web-comic "xkcd" published a strip about writing a virus to force people to listen to their comments on YT before posting in hopes of weeding out the "moronic" comments. :)