Apple has added a very realistic new voice named Alex for text to speech features, reports AppleInsider.
“People familiar with the matter report that individual voices range from about a third to more than a half gigabyte each, and that Apple will supply the voices as downloadable options that can be selectively installed by the user.
The 53 new voices are not yet available for download from Apple, but a synthesized demo of each voice can be played as a demo.”
Full article: http://www.appleinsider.com/articles/11/03/02/inside_mac_os_x_10_7_lion_dozens_of_high_quality_new_multilingual_speech_voices.html