In your opinion, what are the modifications Apple is going to make on the iPhone 8?

sorry, i dont know , neither i can predict something about iphone 8. not even sure they will launch 8 or they will go for 7s. so cant say anything about it.

Apple now doesn't let its consumers in a need for any more modifications but processor and ram speed technology, Maybe also improve the front camera because of the selfie photos 

I think all other specifications are satisfying its consumer's desires  

• 5.8" OLED display
• Faster A11 processor
• Glass body
• Edge-to-edge display
• Facial Recognition, perhaps replacing Touch ID
• No Home button
• Wireless charging
• Three models - One OLED, two standard                            But i am not sure 100%

I guess they will change the fingerprint from home button to the power button.

Expected Feature from my opinion is wireless charging