In a Japanese interview to dc.watch, Tamron talks about them entering the Fujifilm X series market with the brand new Tamron 18-300mm f/3.5-6.3 Di III-A VC VX D.
Down below you can find the summary (based on google translate).
You will also find more images that show the lens mounted on the super small Fujifilm X-S10 as well as fully extended to 300mm.
Note that Tamron says the Fujifilm X market is big enough, hence they will release more X mount lenses in future they can’t unveil now.
The FujiRumors community voted on their top 10 Tamron (and Sigma) wishes already. You can find the results here.
Developing the Lens for Fuji X