As it says in the RYPN announcement, it will have higher pressure, and a few other refinements. Actually, the pressure is planned to be 210 lbs, with superheat and piston valves! It was originally 180 lbs, with slide valves. So that the purists won't be too upset, the piston valves will be hidden in a chest that looks like the old slide valves! With the higher pressure and other modern improvements, it will be more powerful and also more economical to run. There has been some discussion on another forum about whether it should have the straight stack like most Baldwins, or the traditional British chimney with a flared capped copper top.
Phil