Tamron recently announced their first full frame mirrorless lens for Sony E-mount mirrorless cameras Tamron 28-75mm f/2.8 Di III RXD lens. According to recently interview with Tamron executives by dpreview, Tamron is ready for upcoming Nikon full frame mirrorless cameras.
Very important. Everybody is going to mirrorless. Canon and Nikon will launch full-frame mirrorless cameras, probably in the near future. When this happens, we can easily make Canon and Nikon versions of our [native] E-mount lenses. The same design could work for [multiple mirrorless mounts].