Apple's iPhone 6s Plus may look like the latest version of the phone, but there's a lot that has been upgraded. One of the marquee features of the new smartphone is 3D Touch. This allows you to "peek" and "pop" certain aspects of the user interface by pressing harder on the screen. For instance, tapping harder on an app icon will give you shortcuts to launch right into a certain part of that app. The new haptic feedback in the iPhone 6s and 6s Plus gives you subtle taps as you press through the levels of interaction.
The camera in the iPhone 6s and 6s Plus is much better as well. It's now capable of taking 12MP pictures, and it can record 4K video. The front facing FaceTime camera can take a 5MP selfie. It also has "Retina Flash" which detects the lighting around you, and delivers a True Tone flash using the display for more natural-looking skin tones. Another new feature in the camera is "Live Photos." When Live Photos is turned on, it will shoot a few seconds of video before and after a photo is taken. Then you can use 3D Touch while viewing the photo to bring it to life.
iPhone 6s and 6s Plus runs the new A9 processor with 64-bit architecture. Apple claims it improves the overall CPU performance by up to 70% compared to the previous generation. The graphics performance has been boosted by 90%. It also has a much faster Touch ID sensor, and the ability to use Siri hands-free without needing to be plugged into power.
There are a few areas where the iPhone 6s Plus has an advantage over the regular iPhone 6s, though. It has a higher resolution 1080p screen at 401ppi, compared to the 720p screen in the smaller iPhone 6s. It also can achieve better battery life, which can add up to an extra 10 hours of talk time, 2 hours of browsing over data, and 6 days of standby.
iPhone 6s and 6s Plus now comes in a new color -- Rose Gold. It's made from an improved 7000 series aluminum, and has stronger glass on the front.