Loopback to rear-facing downstream TB4 port for DP alt mode video. Synaptics VMM53328 3-port DP/HBR3 MST hub. Parade/Fresco FL5801 USB 2.0 port expander. Via Labs VL822L-Q7 4-port USB 3.1 Gen2 hub controller. Loopback to TB4 upstream port for PD functions?. Via Labs VL822L-Q8 4-port USB 3.1 Gen2 hub controller. Synaptics VMM53328 3-port DP HBR3 MST hub. Parade/Fresco Logic FL5801 5-port USB 2.0 port expander. Cypress CYPD5235 Dual USB-C PD controller. Via Labs VL822L-Q7 4-port USB 3.x Gen2 hub controller. Via Labs VL822L-Q8 4-port USB 3.x Gen2 hub controller with 2x 10Gb/s mux switches. 
OnSemi NCP81239 4-switch Buck-Boost power controller (on daughter board). Cypress CY7C65219 Dock management controller. Component-wise, here is what I was able to determine: I love the design of the dock with its modular power regulator – these are the hottest components and most likely to fail so it’s good to know they are easy to replace. I also did not try a MacBook – but I believe these will be limited to two distinct screens since Mac doesn’t support MST. I have not tried an external GPU cascaded from the downstream TB4 port but I expect it will work OK. Otherwise, 3 external screens worked OK with my Thunderbolt-4 enabled Surface Pro 8 (quick video below) and Laptop Studio. I believe 2x 4K60 is possible on more capable USB-C laptops such as the Surface Book 3 or Surface Pro 7+, but I was unable to confirm given that I don’t have a laptop like that. I confirmed that my Surface Book 2 with regular USB-C (DisplayPort 1.2 alt mode) can run at 1x 4K60, 2x 4K30, or 2x 1080p displays on any combination of display output ports. 1GbE RealTek 8153 for USB-C systems and incompatible Thunderbolt systems. 2.5GbE Intel i225 PCIe-based works on some Thunderbolt systems. 
1x Ethernet RJ-45 with 2 modes of operation. Dual monitor for older USB-C systems and MacBooks. Quad monitor capable via MST (not DisplayLink). 1x TB4 downstream port (up to 15W power and DP 1.4 alt mode capable for 4th monitor). 
up to 100W USB-C PD charging (limited by PSU and attached devices).I got the Lenovo Thunderbolt 4 Dock on launch day and did a teardown.
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