Hey guys, I have some news on the subject of the suspension differences between a Clubsport with 18" wheels and 19" wheels from factory. I wanted to get a 100% clear answer, so, I managed to speak in person to a gentleman by the name of Jürgen Pützschler who works alongside Karsten Schebsdat, the head of chassis development at VW HQ! The answer is, there is a difference in suspension setting/spring rates between a car fitted with an 18" wheel and a car fitted with 19" wheels from factory. Trust this helps anyone wishing to know.
(P.S, I also happen to know that there is 100% an Edition 45 GTI coming! I asked him!)