Amazon (amzn) said that developers who are accepted to test the voices will be able to use them for free, but that will likely change when the voices are available to the general public to be used outside of a preview.
But their addition could make some of Alexa's skills more engaging - especially those involving different characters, like an adventure story or game, for example. Visit the Amazon Polly product page for more information.
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Polly can speak in around 50 voices total in 24 languages, but only these eight are human sounding enough for the developer preview, which is for Skills in the US. "You can even use an Amazon Polly voice for every utterance in your skill if you like".
Amazon announced a developer preview for adding eight Amazon Polly voices to Alexa skills. We'll select a subset of the skills that apply, and will provide more information to those selected. Chiefly, it's the text-to-speech service which helps create the scripts for Alexa skills. The point of having access to multiple Alexa voices is so developers can build skills (apps) in which users interact with a variety of voices instead of just one.