The thread from last week doesnt really cover your question.
I think what your referring too was a proposal to allow p platers to drive turbo cars, so long as they dont exceed 100kw/tonne, as well as some large family cars that were up too 125kw/tonne.
I remember reading an article about it a few months back.
Basically they were saying that the government was going to compile a list of cars which are allowed, but dont get your hopes up about skylines being involved. The main reason for the change (if it does actually happen) is too legalize small turbo'd cars like you see on VW's, Volvo etc. Because they tend to be more fuel efficient and have good safety features.
Cant say i heard anything about the passanger laws for red P's changing though.