According to interview with Tamron USA by dpreview at Photokina 2018, Tamron executive confirmed that they will make more FE lenses for Sony full frame mirrorless cameras. The first Tamron FE lens is Tamron 28-75mm f/2.8 Di III RXD lens, currently still out of stock everywhere, you can pre-order at B&H & Adorama & Focus Camera & Amazon.
Tamron has just announced the development of their first full frame mirrorless lens Tamron 28-75mm f/2.8 Di III RXD FE lens. According to TamronPhotoClub on Facebook, this 28-75mm f/2.8 Di III RXD Lens will be released in April to May, 2018. And it is to compete with Sony FE 24-70mm f/2.8 GM lens, while price is much cheaper than FE 24-70 GM lens.
As rumored before, Tamron will soon announce their first full frame E-mount lens for Sony full frame mirrorless cameras. This lens is Tamron 28-75mm f/2.8 Di III RXD lens.