The 128 TB QLC SSD could come in 2019, but, until then, Samsung has plans to launch successors for the 960 EVO and Pro SSDs with the new 970 and 980 64-layer 3-bit per cell V-NAND NVMe series coming in early 2018.
https://www.notebookcheck.net/Samsung-plans-to-release-128-TB-QLC-SSDs.240774.0.html