If previous years are to go by, we won’t be seeing any external changes in the upcoming iPhone 6s, Apple usually saves the external changes for the iPhone release the year after. Personally, I’d be willing to have a thicker iPhone in exchange for a better battery life.
Apple is also apparently looking to use the same Force Touch technology that’s expected to be incorporated into the upcoming iPhone 6s, into 2016’s iPhone 7. This is probably because Apple suppliers have invested heavily in this years iPhone 6s.
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