This would make the most sense to standardize the lightning connector across the line. A lot better than keeping the 4S around.I was thinking this line up:
iPhone 5C:
8 GB $0 on contract
colors
A5/6 chip
8 MP Camera
4 inch screen
Retina (Maybe?)
Plastic
iPhone 5:
As it is now except $99 for a 16 GB Model
iPhone 5S:
32/64/128 GB for $199/299/399 Respectively
A7
4 inch screen (maybe more resolution?)
Fingerprint Sensor
12/13 MP Camera
Gold Color option
More features to be announced?
*all phones iOS 7 and lightning connector
However there is basically no chance they will increase resolution on the 5S without an increase in screen size. Every change in resolution requires developers to do app redesigns, so apple is not going to have devs redesign apps without a new bigger screen.