The Tamron Photoclub posted the above image and there was an interesting discussion in the comments.
- Tamron is trying to compete with the 2470GM, which is fantastic news and will come in close to the 2470Z so half the price of the 2470GM.
- Shipping end of April, but no later than May.
- Based on a new design not related to the EF/Nikon F design.
- Designed to resolve 40+ megapixels so it should work great on your a7R2/a7R3
- Tamron also hinted that more lenses would come soon when asked about having to adapt the Tamron 15-30mm
Sounds like Tamron might be releasing some wide zooms for Sony FE mount soon.