From what I read two months back on another forum; it could easily cost a good chunk more then a FX5!
Remember this is first generation technology so it's going to cost a bomb, however USB integration is on the surface a fairly cheap and simple setup- two chips, driver and a sazzy bit of software. If the technology catches on it would only be a matter of time before the likes of Kongs/AquaOne, Jebo, Weipro, SunSun, etc start making their own and bring the price of the technology down.
Now I don't have a problem with the potential software updates for my aquarium... but what concerns me is what's a fishy version of the 'Blue Screen of Death'
Stu