We can expect upgraded version of iPhone 6 named iPhone 6s with 4.7” screen size and iPhone 6s Plus with 5.5” screen size. There won’t be any major external changes
Apple will comes with A9 processor, 2GB RAM for this upgraded version.
To overcome the bending issue, it may come with less bendable aluminium shell
Improved Touch ID to unlock the phone, high end camera for better photo experience
New iPhone comes in Space Grey, Silver and Gold colors.
Apple may add its new feature Force Touch in this version
High capacity battery for longer up-time.