Smaller form factor in between current iPhone 7 and iPhone 7 Plus sizes. (Easier to hold.)
IP68 Water-resistance (5ft of depth for up to 30min of submersion.
Wireless Charging (Totally wireless within 3-5ft or traditional inductive QI charging).
Goodbye home button, hello new function area with built in on screen Touch ID 3 fingerprint reader and virtual home button.
OS: iOS 11
Processor: 2.4 GHz A11 Quad core (2 high efficiency cores, 2 low energy cores) smaller 10nm FinFET chip size.
Stacked Logic Board (motherboard) allows more room for a bigger battery inside the device. (New bigger L-Shaped 2 cell battery to be used.)
Memory: 3 GB RAM
Display: 5.8" OLED HDR (Wide Color Gamut) Retina HD Display @1440p 501ppi (pixels per inch) with curved corners and a tall aspect ratio. Perhaps even a curved dual edge display. (Thinner bezels and top/bottom chins.)
Storage: 64, 128, 256 GB flavors.
Cameras: (Back) New 14MP Dual iSight Cameras with better optical and digital zoom capabilities. (Front) Dual 3D 8MP 1080p FaceTime HD cameras with 3D sensing and advanced facial recognition technology. (Rumored Eye/Face Biometric Unlocking Method.) Same rear Quad LED Dual Tone flash as well.
Dual Stereo Speakers
Biggest improvement to battery life yet thanks to the new OLED display, smaller more efficient processor, and bigger battery. (Rumored to be the Longest lasting iPhone yet.)
3D Touch (Force Touch Sensitive) Display with better haptic feedback thanks to bigger or dual Taptic Engine(s).
(Given) Still no more headphone jack but adapter still included in the box.
Quick Charging support via lightning port (fast/rapid charging).
Lightning to USB-C Cable with new quick charging power adapter (brick).
Rumored (VR) Virtual and (AR) Artificial Reality capabilities to be introduced.
New hidden advanced ambient light sensors allow cleaner front display.
Colors: Jet Black, Matte Black, Silver, Gold, Rose Gold (Pink), and new Deep Blue.