These pools opened in August 07 and do not seem to be very well known or promoted. We saw an ad in one of the local guide books.
Pools are located 10 - 15 mins out of Queenstown and they have a free shuttle bus that picks up at "The Station" which is in central Queenstown. The complex consists of 6 private rooms which each have their own hot tub, heated to 39 degrees celcius. There is a retractable glass window which opens up to reveal a wonderful view of the shotover river, so you can sit in the tub and look out onto the view. Each room also has a shower and changing area so you are completely private.
One impediment to privacy is the helicopter which periodically goes past on its way to drop passengers off for rafting trips. So if you are standing naked in the room, you may well have a bunch of rafters having a gawk! YOu can hear the helicopter coming so can get down into the water if needs be.
Charges are $70 for 2 people for 1 hour. This is a bit on the steep side, but it was a lovely experience. My only gripes would be that they charge an additional $2.50 per person for towels which should really be included and there is also a lack of atmosphere in the communal area where you first arrive to. It is a bit stark and not very "zen". However when you go into you own room, it is simple but nice.