Better cooling, keyboard, GPU puts the 16" MBP right in the very front ranks of 15-16" mobile workstations. The GPU is already highly competitive with other thin and light workstation-type designs (other than the unreleased Razer Studio, which is in between a thin and light and a full size 15").
What a lot of people here want (and I agree - I'm not sure whether it is what Apple will build) is something in between the thin and light category and the full size 15" category. I haven't seen a clamor for spinning drives, but full size 15" cooling and a higher end GPU would be appreciated.
There are essentially three tiers of mobile workstation designs (as opposed to gaming laptops, which are thicker, heavier, cheaper, less reliable and often lack high-resolution displays).
1.) 15" thin and light - 6 (primarily) and 8 core CPUs, long battery life, modest GPU, 32 or 64 GB RAM capacity, SSD only, ~4 lbs (Lenovo P1, Dell 5540, HP ZBook Studio, MacBook Pro)
2.) 15" full-size - mainly 8-core CPUs including Xeons, reasonable battery life, modest GPU (occasionally with a higher-end option), 64 GB RAM capacity (sometimes 128 GB), SSD plus 2.5", ~6 lbs (Lenovo P53, Dell 7540, HP ZBook 15, Razer Studio (sort of)).
3.) 17" full size - mainly 8 core CPUs including Xeons, limited battery life, higher end GPU options, 128 GB RAM capacity, multiple SSD and 2.5" bays.
The Razer Studio may be a hybrid between the thin and light and full size designs - Quadro RTX 5000 but SSD only, limited SSD capacity (so far, Razer hasn't announced options >1 TB),may have a 32 GB RAM ceiling, fancy cooling...