Valerio, I have been involved with Aquatica since 1991 and already that was the end of the line for the A80 when I started with them, with the trend shift toward AF camera with integrated film advance, as opposed to the previous manual focus and motor driven camera such as the Nikon F3 and Canon F1, it was decided to take advantage of the more compact design of the contemporary F90 cameras and switch over to a bayonet type of port.
As for the Sport, while the model designation started as a A80 housing shell, it soon replace with a housing based on a A90 type bayonet housing, which was indeed marketed for a while. I am sorry to hear that this did influence your decision, but I understand, As with many a manufacturers, we do have to keep up with progress and sometime this ruffles some feathers, many of you will recall the Canon switch from FD to EF mount for taking advantage of the newer technologies.