If you've got an Apple developer account, you should know that Apple has released iOS 7.1 beta 5 build 11D5145e, and you can go and grab it right now. Of course, you can log in to the Developer Center to manually grab the file, or head into the Settings > General > Software Update section on your iOS device for the over-the-air install. As far as new changes, the release notes point to international Siri improvements:
"This seed adds new natural-sounding Siri voices for English (Australia), English (United Kingdom), Japanese, and Chinese (Mandarin – China)"
Along with the new iOS software, Apple has also released new betas of Xcode 5.1, and the Apple TV software as well.