My predictions are:
There will be 3 models
Iphone 7
4.7 screen with 1080p LCD screen with true-tone tech from ipad pro 9.7
waterproofing and dustproofing
No Headphone jack
Almost same Physical design front and back except antenna lines moved slightly
Bigger 12MP camera sensor from SONY and SAMSUNG with Dual Pixel tech with f1.7 but no OIS, Front Camera will have f1.7 but it will stay 5MP
4K video, 1080p @ 240 FPS
iOs 10
2GB RAM
tri-core CPU A9x from ipad pro 9.7
Obviously better GPU
No wireless charging
Home button will stay with touch ID
32GB, 128GB, 256GB options
Price will start at $599
Iphone 7 Plus
5.5 screen with 2k LCD screen with true-tone tech from ipad pro 9.7
waterproofing and dustproofing
No Headphone jack
Almost same Physical design front and back except antenna lines moved slightly
Bigger 12MP camera sensor from SONY and SAMSUNG with Dual Pixel tech with f1.7 with OIS, Front Camera will have f1.7 but it will stay 5MP
4K video, 1080p @ 240 FPS
iOs 10
2GB RAM
tri-core CPU A9x from ipad pro 9.7
Obviously better GPU
No wireless charging
Home button will stay with touch ID
32GB, 128GB, 256GB options
Price will start at $699
Iphone 7 Pro
5.5 screen with 2k LCD screen with true-tone tech from ipad pro 9.7
waterproofing and dustproofing
No Headphone jack
Almost same Physical design front and back except antenna lines moved slightly
12MP Dual camera sensor from SONY and SAMSUNG with Dual Pixel tech and LINX optimization with f1.7 with OIS and 2 to 3 times zooming and amazing bokeh effect. Front Camera will have f1.7 but it will stay 5MP with some sort of crazy photo and video editing capabilities right on the phone.
4K video, 1080p @ 240 FPS
iOs 10
3GB RAM
tri-core CPU A9x from ipad pro 9.7
Obviously better GPU
Dock Connectors for wireless charging
Home button will stay with touch ID
32GB, 128GB, 256GB options
Price will start at $749
Those are my predictions after doing some research and knowing apple history.