The catalog for the upcoming Tamron 18-300mm f/3.5-6.3 has now been shared by nokishita. You can find it down below.
According to the catalog, the release date for the Tamron 18-300mm f/3.5-6.3 should be September 24 for the Sony version. It’s a bit confusing if also the Fujifilm X mount version will be released by then, as it is written “to be released”.
You can find the lens listed here at BHphoto.