If such item will come to the market in this year, it will be quite expensive, as it has to use fast flash memory to even take advantage of the interface.
USB flash memory thumb drives usually use cheap flash memory, which even USB can't fully use due to low read (10 to 30 MB/S) and write speeds (5 to 20 MB/s).
Similar thread from three weeks ago: https://forums.macrumors.com/threads/1129668/