There are rumors going around that Apple will not include a 3.5mm headphone jack in it future iPhones. They say that instead customers will use the lighting port that is already built into the phone.
There are potentially pros and cons if this rumor turns out to be true. First by removing the headphone jack, it would require an adapter to use your normal headphones. Even though there are headphones coming out that use the Lighting plug, the vast majority of people use headphones with the 3.5mm headphone jack. So this would be the biggest con.
Rumors are that in order to make the phone thinner, they would need to do away with the 3.5mm port. But iPod Touches are thinner than iPhones and yet they still have the 3.5mm port. So that doesn’t seem to be a logical reason.
A pro of making the switch could be better sound quality. Currently the digital file on the phone has to be run through a digital to analog converter so it can be heard from headphones, and that process leads to degradation in the quality of the sound. But how much better and if the vast majority of people will even notice it has yet to be seen, or heard in this case.
Another con would be if you wanted to listen to music while you charge your device, having one lighting port would mean you have to chose between one or the other.
I would say this is just a rumor, it doesn’t make much sense and there are not enough options out in the market place to make this a viable option for Apple, I don’t believe this will come true.