Well, I got a very prompt reply to my MNZ email enquiry. Paul Stewart, the Road Racing Commissioner gave a very helpful reply and basically said:

1/ A review is in progress but no rule changes will be taking place for the 2009 series.
2/ Proposed rule changes for 2010 will initially be sent out in draft form for comment
3/ He is aware of the need for the proposed rules to cater for existing bikes competing slongside the new bikes

Considering that I initially contacted the wrong person I'm pretty impressed with MNZ's response.