A: Hey leeroynz,
Neural voices are included in all tiers. There are several voice engine partners globally. One of them made a great development and called the voice types as neural. We listed them with HD to differentiate on Voiser Studio. For now, you have 400HD voice skins in 140+ different languages/accents. They're non-HD but which are not bad, provided by other voice engine suppliers. Total is more than 550+ voice skins.
Our reply was pointing out that having API with HD/Neural voice would be greatly advantageous.