Being that the W-3275 maxes out at 1TB of RAM, it can be assumed that Apple already uses the W-3275M to reach 1.5TB of RAM. One will need to test the 28-core with 256GB and 128GB RAM modules to verify that the Mac Pro (2019) supports 2TB on the W-3275M, W-3265M and W-3245M.
The WiFi/Bluetooth are located on the power button board. It appears the antennas are somewhere within the top part of the frame. See Step 13, first picture. You can see the antenna wires on the left side and the WiFi/Bluetooth hiding under the large ribbon cable.
Dan - your statement is actually false. They updated the LCD on the 2016 USB-C/TB3 models to be 67% brighter than the previous generation, higher contrast ratio and a 25% wider color gamut that now includes P3 color space.