In an email to some Windows Insider testers, obtained by The Verge, Microsoft is looking for iPhone users to trial the Word Flow keyboard. It's not clear when Word Flow will be released publicly on iOS, but Microsoft is already ready to test it more broadly so it will likely arrive in the coming months. Microsoft's Windows Phone version of Word Flow includes autocorrect, suggestions, gestures, and the ability to swipe letters (like Swype) to type out words.
I'm actually excited about this. I can't stand the iOS keyboard, but I consider the Windows Phone keyboard to be the best one around.