Give it time my friend.
But what exactly takes time here? This is not like introducing a new course, surely? Why were't all the new clubs ready and out as soon as the old ones went? I'm assuming the characteristics of each club are determined by the stats and the actual make and model is just about the skin? This seems easy to do to me.
The reason I raise this is that this lag really has an impact on players - I used the discount after levelling up to get money off items and planned my purchases around this. Anyone levelling up now is potentially disadvantaged by the lack of options in the shop and the discount is very limited in time. There's no way to prevent levelling up if you want to keep the daily bonus going, and this all seems quite unfair to me.
The only conclusion I can really draw from all this is that WGT are playing this to gain maximum revenue from players. I suppose that's economics, but they need to be a little bit careful - players will eventually get fed up with this kind of thing and stop playing...