Tamron USA has begun teasing four new mirrorless lenses on their Facebook page.
There's no mention of what the four lenses are as of yet, or what mount(s) these lenses will be available for. I think it's still a bit early to see third party autofocus lenses for Canon's RF mount from Tamron or SIGMA, but surprises do happen.
Tamron currently has 2 mirrorless lenses for Sony's FE mount, so it's likely these will be for Sony as well. Judging by the teaser, it looks like a telephoto zoom lens and three prime lenses are coming.