There will of course be software updates. But I suppose those will appear on all 320s. The only difference is the addition of a HUD. But then those can quite easily be added onto older 320s as well.
I think Airbus saw no real reason to change the setup of the cockpit. Adds extra cost and reduces commonality with the 320 CEO. In addition it might not have been feasible given the design of the cockpit, and may have required a redesign, which Airbus were not prepared to spend on.