The IPhone 6S recently came out, and I wan't to talk about some of the changes it includes.
One of the new additions to the IPhone is the 3D touch. For example, if u click and hold on an e-mail, it will pop up as a little box and you can read it easier. You can also do this by pressing down in your IPhone screen on the side area of the phone. They have also updated the IPhone's CPU to 70% faster, they updated the IPhone's GPU up to 90% faster. The phone also now has a 64-bit architecture. I recommend buying or upgrading to the IPhone 6S due to a few major updates.
