Since upgrading to xCode 6 and iOS 8 I've noticed serious issues with AVSpeechSynthesizer. Prior to the upgrade, it worked perfectly, but now, several issues have risen.
Please, any help would be greatly appreciated. Thanks in advance.
For second issue, see this answer for AVSpeechUtterance - Swift - initializing with a phrase.
As for me - iOS 8 also did not support properly languages other than phone language + english.
upd dec-2014: XCode 6.2 beta2 did resolve issues with TTS in simulator and (maybe) with TTS rate.