Yesterday I visited my local post office to buy a pile of International Reply Coupons. I asked if they had started to sell the new Nairobi Model but they didn't know of any new IRCs. At the end I bought just a few to make sure I'm not getting stuck with a lot of old invalid coupons.
According to several sources the Nairobi Model IRCs should have been available from 1 July 2009 and be valid until 31 December 2013
I've sent an e-mail to the Norwegian Postal Service and asked about this.