iOS 9 defaults the keyboard to showing the visual key presses rather than Character Preview (you can still turn it on in Settings/General/Keyboard) and I don't see why that won't be available for the iPod Touch.
As far as Proactive, I don't think it's available for iPhone 4s but not sure about he iPod Touch. It does have an A5 processor like the iPhone 5, but it's clocked at a slower speed so it may not be able to handle some processor intensive features.
The iPhone 5 has an A6 processor not A5...