There are excellent things on this new Master 8 Days Perpetual, such as the case, the movement, the reduced volumes, and the simpler dial.
Though, I think some details can be improved on the dial ( the moonphase, and the upper part of the dial: Reading the Day / Night indicator is not very intuitive ).
All in all, an excellent offer from JLC, in my opinion.
A new Master Calendar?
Well, if we consider that JLC is revisiting all their Classics, yes, some hops is allowed, in a close future, but this is just my guess.
Best,
Nicolas.