A report from Bloomberg has it that Apple is arranging with manufacturers and suppliers to make some early production units of iPhone 6S.
Those early production units will have a feature called the force touch similar to Apple Watch.
Those units are probably meant for evaluation of the force touch feature and the same report has it that iPhone 6S will retain the design and look of iPhone 6.
The report is likely to be true as there are so many suppliers working with Apple and it will be easy for such a news to be leaked and got out of Infinity Loop.
Another earlier report has it that because of force touch, the iPhone 6S will be slightly thicker than iPhone 6. There was also a possibility that force touch feature would only appear in iPhone 6S Plus and if this is true, the next iPhone 6S Plus could become the premium iPhone model.