Apple has released iOS 10.2 to the general public today. The last time that Apple launched an iOS update was on October 31st with iOS 10.1.1. This update includes several major features and many bug fixes.
Apple has changed the Power system after releasing the iPhone6S and iPhone6Splus. You can easily notes that when you compare between the (iPhone 6) & (iPhone 6s) board. They used new Power IC.
When you compare between the IPhone 6/splus board and the IPhone 6S/6Splus, you can easily tell that the Touch & Display system has changed.