It was just for Sky start up package, though the reason for the post is that as far as I am aware, in the 5 years I have been here I have not seen a Sky ad. on any other channel than Sky owned Prime. I heared that TVNZ and Mediaworks refused to play Sky ads, so this is a mile stone 3-4 Months out from Sky going HD. I believe that Sky may have done a pay per sub. deal with Mediaworks.
Don't TV3 have a small % ownership in Sky, so advertising them makes sense (or might be part of the deal). TVNZ used to years ago but they sold it. That was when the preferred TV channel button changed from 1 to 3.