TechnoBuffalo has posted a range of images showing a device with Fitbit design language, but in colors previously unknown to this brand. They are apparently called Cyan Blue, Silver, Rose Pink and Purple. The renders have led to speculation that they are for the Fitbit Versa 2, but are more likely to simply be new color options for the pre-existing Versa.
https://www.notebookcheck.net/Renders-for-possible-new-Fitbit-Versa-SKUs-surface-online.403196.0.html