Sony is likely to have a new product announcement at the last week of August, 2019. Previous rumors said that the new product to be announced in this month could be Sony a6700 or a7000. And we have just received first rumored specs for Sony a6700 or a7000:
The Sony a7R IV is the latest full frame mirrorless camera from Sony, it has a ground breaking 61MP full frame sensor. Here is a quick specs comparison for Sony a7R IV with a7R III with Nikon Z7 with Panasonic Lumix S1R. You can take a look at full specs comparison here.
Tamron China has already leaked the full specs, images, price of FE 17-28mm f/2.8 Di III RXD Lens (B&H Photo Video/Adorama) for Sony full frame mirrorless cameras. The US price for Tamron 17-28mm f/2.8 Di III RXD lens will be $999, $100 more than 28-75mm f/2.8 Di III RXD lens.