The impressive ultraportable 8 TB external SSD is in prototype phase and will become available in 1-2 years. In contrast, the SanDisk Ultra Dual Drive Luxe USB-C 1 TB stick and the new WD_BLACK external drives for gamers are expected to hit the market this quarter, but pricing info is still unknown.
https://www.notebookcheck.net/Western-Digital-showcases-ultraportable-8-TB-external-SSD-1-TB-USB-stick-and-new-WD_BLACK-external-drive-series.449416.0.html
I like the design of the Black series though I have to point out that they're probably mimicking Seagate 7(which I would've bought if there was a proper 4T option, instead of a meager 500GB).