The lens's mount is perhaps even more interesting than the lens itself: this will be Tamron's first lens designed for full-frame mirrorless cameras.
Essential Elements of Photography
Tamron 28-75mm f/2.8 Review for Sony Cameras
Product Page, 28-75mm F/2.8 Di III VXD G2 (Model A063), E-mount
28-75mm F/2.8 Di III VXD G2 (Model A063), Lenses
Buy Tamron 28-75mm f/2.8 Di III RXD Lens for Sony E Mount (A036) - E -Infinity
RUMOR: Sony might announce a new 28-75mm f/2.8 FE lens – sonyalpharumors
Tamron 28-75mm f/2.8 Di III RXD Lens Sony
Used Tamron 28-75mm f/2.8 Di III RXD - Sony FE Fit
Tamron also thinks Nikon will launch full frame mirrorless camera in the near future - Nikon Rumors
Tamron 28-75mm F/2.8 Di III RXD (Model A036) Sony FE - DXOMARK
Tamron 28-75mm f/2.8 Di III RXD Full-Frame Lens for Sony E-Mount, Black {67} A036 at KEH Camera
Tamron 28-75mm F/2.8 Di III VXD G2 Review
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Tamron vs. Tamron: Is Tamron's New 28-75mm f/2.8 Zoom for Sony E Better Than Their Original Lens?
Tamron 28-75mm f/2.8 Review for Sony Cameras
Tamron 28-75mm f2.8 Di III G2 review