in the attached article it is claimed that M PS Cups are the standard road tyre for the GT2 and TT. I've not seen any TT's come with PS Cups as standard. Cups are semi-slicks - the same tyre that Nissan is accused of using.

Agreed - that math never added, but it still doesn't for me. Porsche better start pulling their finger out, forget giving us improvments in a piecemeal fashion to maximise profit and marketing spin, and start producing fast machines!