TextExpander 3 for iPhone is a special kind of iOS 8 keyboard that isn't for everyone, and it may not be your choice for day to day use, but if you need to type a lot on the iPhone it may be a great option.
iOS 8 already supports keyboard shortcuts, but the TextExpander iOS 8 keyboard delivers access to your TextExpander snippets from Mac and can be used to quickly pull in long phrases without typing out every letter.
The video above shows how the TextExpander iOS 8 keyboard works. Works on iPhone and iPad. This isn't an iOS 8 keyboard for everyone, but for some users the snippets and shortcuts are the way to go.
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