A small change in iOS 8, but if you develop for Hebrew speaking users it may of interest. The AVFoundation classes for producing synthesized speech from text have added Hebrew as a supported language. This brings the total count of supported voices to 37. The sample project, SpeakEasy that I previously published for iOS 7 works on iOS 8 unmodified if you want to test the Hebrew support:
For reference, the updated list of available languages is shown below with both the display name (English locale) and the BCP-47 language code used when creating the voice.
Arabic (Saudi Arabia) - ar-SA Chinese (China) - zh-CN Chinese (Hong Kong SAR China) - zh-HK Chinese (Taiwan) - zh-TW Czech (Czech Republic) - cs-CZ Danish (Denmark) - da-DK Dutch (Belgium) - nl-BE Dutch (Netherlands) - nl-NL English (Australia) - en-AU English (Ireland) - en-IE English (South Africa) - en-ZA English (United Kingdom) - en-GB English (United States) - en-US Finnish (Finland) - fi-FI French (Canada) - fr-CA French (France) - fr-FR German (Germany) - de-DE Greek (Greece) - el-GR Hebrew (Israel) - he-IL Hindi (India) - hi-IN Hungarian (Hungary) - hu-HU Indonesian (Indonesia) - id-ID Italian (Italy) - it-IT Japanese (Japan) - ja-JP Korean (South Korea) - ko-KR Norwegian (Norway) - no-NO Polish (Poland) - pl-PL Portuguese (Brazil) - pt-BR Portuguese (Portugal) - pt-PT Romanian (Romania) - ro-RO Russian (Russia) - ru-RU Slovak (Slovakia) - sk-SK Spanish (Mexico) - es-MX Spanish (Spain) - es-ES Swedish (Sweden) - sv-SE Thai (Thailand) - th-TH Turkish (Turkey) - tr-TR