We all know Apple is trying to rid iOS of any thing even related to it's competitor Google, so that's what Yahoo is for. 

According to Re/Code Yahoo is readying a pitch to throw at Apple on it's take on it version of everything and where it plans to take it brand in the future and also apart of that pitch is to allow Yahoo to be it's default search for iOS.

If your familiar with iOS as most are currently Google as of now is the default search engine and you can change it to either Bing or Yahoo. Yahoo I can see my please for god sake get rid of Bing it's awful and looks even worse, but anyways stay tuned for updates and see if Apple goes with Yahoo for iOS 8......