We'd hope a "new model" means a unique lens and not simply a mount conversion of an existing design. What we do know is Tamron is continuing to produce lenses for Nikon Z, Fujifilm X, Sony E ...

with Nikon making f/1.4 and f/1.2 lenses as well, plus a 40mm f/2, but this f/1.8 wins for being compact, fast and sharp, which is what you want from a lens. Tamron’s only prime for the Z mount ...