Given no news from Ming-Chi Kuo on the 13", I would guess that will only get a processor bump (the 9th Generation processor leak showed quad-cores suited for the 13"). It could either be conventional 9th Generation i5s or the odd Intel chips with AMD GPU modules that have shown up in the past couple of years.
My guess on the 15" (or 16") is three models, two of which are in the new 16" chassis, while the lower-end model is a carried-over 15" Touch Bar MBP. This offers a lower-cost option, while also addressing a CPU dilemma. The four 8-core CPUs Intel is releasing only account for two MBPs. There are two i9s with very modest performance differences plus two i7s that appear nearly identical (probably a minor feature difference that didn't show up in AnandTech's chart). It's easy enough to get two MBPs out of those four chips, but not to get two plus a "boosted" processor option. There is no chip that appears to be the successor to the 2.2 GHz i7 in the lower-end model.
How about these three MBPs?:
16" (4K+) i9, 32 GB/1 TB (standard), Vega 20 or 7 nm successor $3499 (the only sure CTO upgrade option is SSD capacity, we could see a 64 GB RAM option and/or a GPU bump option, either to a higher-end GPU or just GPU memory).
16" (4K+) i7, 16 GB/512 GB TB (standard), Vega 20 or 7 nm successor $2799 (CTO upgrades to RAM, SSD capacity).
15" (existing) 8th Generation i7 (existing 2.2 GHz chip), 16 GB/512 GB (standard), Vega 16 $2299 (CTO upgrades to RAM, SSD capacity, possibly GPU).
The high-end model is expensive, but it offers a lot, including not only the i9, but generous stock RAM and SSD. There may be a CTO upgrade (64 GB? a GPU upgrade?) that is exclusive to the i9 model as well.
The midline model is priced like the existing high-end model, and it offers a decent processor bump, Vega 20 standard and the new design.
The lower-end carryover model gets Vega 16 and 512 GB standard (which they should be anyway) and a $100 price cut. The year-old 6-core chip carries over, but it's a better option than anything in the 9th Generation - which would have to be a quad-core i5.