What we know about it? Nothing for sure but we have some leaks:
Water- and dustproof case without headphone jack, force buttons on sides and same type of home button; two-lens camera int iPhone 7 plus, design similar to iPhone 6s.
Next leak says that build-in storage will be bigger: 32GB in cheapest version, 64GB in middle and crazy 256GB in most expensive one. Ram will increase from 1GB to 2GB in normal version and 3GB in 7 plus.
Next interesting leak is new OLED screen. Battery is also bigger – 7.04Wh or something about 1800mAh.
I’ll say it once more – it’s not 100% sure informations for this we must still wait.