iOS 8 would be coming to users on September 17th. We know that iOS 8 would have provison to use 3rd party keyboards like Swype, SwiftKey etc.
The iOS version of SwiftKey keyboard will be released on the same date as the release of iOS 8, i.e 17th September only.The SwiftKey Keyboard will work on iPhone, iPad and iPod Touch. Although the SwiftKey Flow feature, that lets you slide from letter to letter, will be iPhone and iPod Touch only. SwiftKey will allow users to type in two languages at the same time without switching keyboard. SwiftKey for iPhone and iPad delivers support for multiple languages, predictive text and auto-correction. At the moment it has only support for limited languages like English, Portuguese, French, German, Italian, and Spanish.