No, I got the info regarding the taxiway from some people I know at Domestic Airline Group (Air New Zealand), and the runway thing is what is always put in the AIAL publicity. But as you well know, resource consent in NZ is a pain in the backside. Especially when (no racism intended here, please dont read it as it!) the land is subject to Maori land complaints and environmental issues.
Perhaps there might be something on AIAL's website http://www.auckland-airport.co.nz/
, although I have never seen anything much there before. I do have a brochure from 1994, detailing the plans for up to 2010. Furthermore, the model of this is still in the Air New Zealand (make that the only, now!) Domestic Terminal at AKL.
"So powerful is the light of unity that it can illuminate the whole earth." - Bahá'u'lláh