I don't think there will be price increases, since next gen will be pretty much the same as this gen but at 1080p 60fps, but more stuff like online codes will appear.
Targeting 30fps to push more graphical jazz on the screen has been pretty much the standard for the last three generations, you really think that will change next gen?
Extra effects and features will take more manpower in many areas, the cost has a very good chance of going up IMO.