Looking past the marketing spiel - where is Intel on this? The idea of 3d stacking lattices and RAM has been knocking about several years now. Provided the chip yield works out this is amazing. As far as I can tell yield is the only remaining advantage of Intel's older processes.
Mildly annoying it's a CPU socket change in the next model rather than fitting older boards (yay, more e-waste) though to be fair, we all knew the 3000/5000 were going to share a socket with the one after on a new board.