"I'm assuming, and you know what that does, that Italierie has re tooled the deck to show the correct superstructure for a 103 Class boat. I'll be very disappointed if they have simply included mid-war torpedo tubes, a mid--war Oerlikon, etc., and left us with the late war hull." [Quote]
The photo of the model is a bit blurry, but I don't think Italeri is adding just a few cosmetic changes. I've built the '596' and this new version looks very different to me. If you look at the starboard (forward) turret, it appears that it has been moved . There is a definite gap visible behind it. The roof of the Day Cabin looks different, it has the ventilator at the rear. The cockpit is just barely visible, but the little that can be seen also looks different to me, as does the roof of the radio room. There are also visible differences in the engine room hatch and ventilators between the two kits.  When I built the original kit, there were numerous holes under the deck that needed to be opened up. There were also a lot of unused holes that weren't to be opened up, and there were some extra decklights molded in aft, that would later be covered up by the 40mm mount. I thought at the time that these could be signs that an early war boat would be coming along eventually. I wouldn't be surprised if a third version shows up, combining parts from both kits to make a 'Mid-war' boat. Many of the early boats were upgraded with several of the features included in the '596' kit. I hope the after-market guys are on the ball. There is a lot of opportunity here for modification. 

 Al