Samsung has allegedly secured a trademark for a new product called the "Portable SSD T7 Plus". Should this leak prove true, it appears that a successor for the T5 is on its way. This putative product may at least maintain a trend towards max speeds of 540 MB/s, 256-bit AES encryption and a USB 3.1 Gen2 interface in a form weighing just 0.11 pounds.
https://www.notebookcheck.net/Samsung-reportedly-trademarks-a-new-T-series-portable-SSD.423977.0.html