TVNZ and Canwest might comment on it, but I doubt Sky has any input in FreeViews activities.
FreeViews original plan was to have the main Tx's (KauKau in your instance) up and running by the end of this year. Potentail frequencies are UHF channels 36,40,48. However as COFDM can be placed in adjacent channels to analog transmissions, albeit at reduced power it could also appear on other UHF channels. But those three are the ones most likely.
From Titahi bay you are not likely to get good coverage from KauKau unless you are up on the hill. Coverage from Baxters Knob is more likely, and I doubt you will see that Tx upgraded for a while yet.
Current talk is that you will need a DVB-T reciever capable of mpeg4 decoding.
Until FreeView make some more media releases, I doubt you will get a better handle on the DVB-T rollout schedule. The DVB-S service (only requiring mpeg2 decoders) is meant to start at the begining of April according to the local talk.