According to their site:
SYD SKL will be closed for renovation works from 13 August 2013 to end November 2013.
You are invited to the Air New Zealand Lounge. We regret that customers will not be able to bring a guest.
Conditions will apply for Platinum and Gold Velocity Members travelling in Economy Class, subject to availability.
We apologise for any inconvenience caused.

I am flying back to the States in GF 3rd week of Dec so hoping it's up and running by then as I'd like to check it out and then head to Air NZ to meet a friend who will be crossing paths in Sydney on the same day.