Hmm, as far as the specs go here is what I think:
XB2 streaming box (100-150$):
CPU: 7nm Zen2 - 4C/4T @2GHz
GPU: 7nm Navi8 - 512C @1-1.2TF
RAM: 4GB GDDR5 @112GB/s
HDD: none/build-in 32-64GB flash/small (250GB max) 2.5" HDD
UHD BD: no
It will be basically just a hub for all the MS gaming services (with strong emphasis on Game Pass), something like NV Shield for example, so not much processing power will be required just to run the UI (may be even passively cooled and dead silent), and it won't actually require any HDD as games, patches, saves, DLCs etc. will be stored on the servers.
XB2S (250-350$):
CPU: 7nm Zen2 - 8C/8T @3.2-3.6GHz
GPU: 7nm Navi40 - 2560C @6.4-6.9TF
RAM: 12GB GDDR6 @576GB/s
HDD: 2.5" HDD @2TB
UHD BD: yes
First model of the Scarlett family, which in nature will be a refreshed X1X, with seriously beefed-up CPU this time around, and slightly faster GPU and memory, as well as being quite cheaper thanks to 7nm process node. It will be aimed for 60FPS gaming, but in FullHD, with optional 4K30 - as the hardware sales show (>100MLN of base PS4/XB1) , people are not into 4K that much, they still have those large HDTVs they bought for hundreds-thousands of dollars couple of years ago, and they are here to stay, targeting this audience will bring the largest profit.
XB2X (500-550$):
CPU: 7nm Zen2 8C/8T 3.2-3.6GHz
GPU: 7nm Navi80 - 5120C @12.8-13.8TF
RAM: 16GB GDDR6 @768GB/s
HDD: 2.5" HDD @4TB
UHD BD: yes
The new king of the jungle, build specifically with 4K60 in mind, with 10x stronger GPU compared to the OG XB1, and 4TB hard drive to support all those 100+ GB games with 4K content. After X1X success, they will want to maintain the "strongest console on the market" label, and being recognized as the best place for all the multiplatform games.
PS5 (400-450$):
CPU: 7nm Zen2 8C/8T 3-3.2GHz
GPU: 7nm Navi64 - 4096C @10.2-11TF
RAM: 16GB GDDR6 @640GB/s
HDD: 2.5" HDD @2TB
UHD BD: yes
VR: Yes
I hardly believe Sony will aim for the ~400$ spot again seeing how well PS4, PSVR and PS4 Pro did with that price tag, hence, they will save up a bit on the CPU, GPU and HDD, but the console will still be heads and shoulders above current consoles, and will still do 4K60 with ease (while being cheaper than the strongest XB2, and slightly more expensive than the weaker XB2). That being said, Sony will equip PS5 with additional coprocessor(s) that will make every unit VR ready, so whoever will want to get into VR will just have to buy the goggles alone, which will be even cheaper this time around since no processing box will be required. I'm not sure if they will release their own streaming-only PS5 based on their interviews, they will expand PS Now on broader selection of devices of course, but won't build a console specifically just for that IMO. A PS5 Pro will eventually show up somewhere in 2023, once production in 5nm process goes full-scale, with the end result being something like this:
PS5 Pro (400-450$):
CPU: 5nm Zen3 8C/8T 3.8-4GHz
GPU: 5nm Navi96 - 6144@15,4-16,6TF
RAM: 16GB GDDR6X @1TB/s
HDD: 2.5" HDD @4TB
UHD BD: yes
VR: Yes
Faster CPU, larger GPU, G6X memory, and 4TB HDD, pretty much just an basic upgrade, just as the current Pro is.