Well, strictly speaking, the dates have been announced for the 2012 ACC meeting in Auckland, New Zealand. But I think one may presume that ++Rowan will come to the meeting, and thus come to NZ, and thus come for the first time as Archbishop of Canterbury to NZ. (His first visit here ever in any capacity?)
From ACNS's Day 4 Report of the AC Standing Committee:
"The Standing Committee agreed that ACC-15 will be held from the 27 October to 7 November 2012 in Auckland Cathedral."
Naturally, ++Rowan will want to come to the South Island ... the real New Zealand ... and give a lecture sponsored by Theology House :).