I agree with Falhofnir - the 2019 15" (16") MBP is basically the result of a decision (probably taken in 2017 when they realized both that they needed to do something with the keyboard
and that they were going to see repeated YetAnother Lake 14nm+++++ CPUs) to accelerate a 2020 redesign. The good news is that it's a bigger redesign than we'd otherwise have seen... Probably a new keyboard, probably a bigger screen, probably a cooling upgrade, maybe a 64 GB RAM option at the high end, maybe a screen upgrade in addition to size (10-bit? 4K?), maybe a 99 wh battery.
The bad news for 15" fans is that we're in for quite a bit of YetAnother Lake. We haven't seen a high-end mobile roadmap out of Intel in the recent spate of leaks and presentations, but the 45W mobile chips are pretty closely tied to the fate of the mainstream desktop chips, and desktop won't be going 10nm (or maybe directly to 7nm) until
2022. Meet not only Comet Lake, but
Rocket Lake as well. Both are upcoming Skylake-based 14nm++++ desktop CPU families that will be released before anything on a new process. They go up to 10 cores on the high end, and they come with a new socket and new chipsets.
https://wccftech.com/intel-desktop-mainstream-hedt-cpu-roadmap-2020-leak/
All those 10nm mobile chips that are supposedly close to release? All 15w and under, a whole batch of quad-cores, with dual-core 5-7w parts mixed in. No sign of a 45w chip (or even a 28w) chip in the bunch. Oddly, there are also 10nm Xeons in the pipeline...
Every mobile Mac below the Pros is getting its 10nm CPU in the next 6 months, but only the bottom of the 13" Pro lineup, and nothing at all for the 15-16".
If I were Apple, I'd replace the 13" Pro with a larger Air/MacBook (14"?) , using the highest-power 10nm CPUs they can get, and move the 15-16" out of the ultramobile space. Let it gain half a pound into the weight range of the lighter 15"+ mobile workstations from HP and Lenovo or the 15" Razer Blade (they're well over 4 lbs, but still under 5), but put the weight into the best display they can find, cooling that lets those hot YetAnother Lakes perform, and a great keyboard. Maybe they can cram a slimline mechanical keyboard in there???