"I think you’re unlikely to ever see this."
Micron currently do a variety of LPDDR4 RAM chips with the 64Gb chip being the largest at present.
I believe this is on third-generation 64-layer 3D NAND - if so, the 128-layer fourth-generation processes expected later this year should provide for 128Gb chips and a 16GB model assuming the current global economy supports such a product versus extending the life of third-gen products.