Tamron is fully committed to the E-mount system. And that’s certainly a good news for Alpha shooters and not so good news for the expensive Sony made lenses :)
Here are two rumors:
1) SAR confirmed the Tamron 70-180mm FE lens will ship out in Spring.
2) Tamron will announce up to six more FE lenses in 2020. Most of them will be pancake f/2.8 lenses and zooms. All affordable but still high quality glass!
And I bet Sigma will release a large number of new E-mount lenses too..