Hopefully its got at least 2.5 GbE. It doesn't even cost much more than 1 GbE, and for a dock that costs hundreds of $ and boasts of 120 Gbps transfer rates, it should at least have that, if not 10 GbE.
A reliable leaker has provided a first look at Lenovo's ThinkPad dock equipped with Thunderbolt 5 ports. Dubbed the ThinkPad Smart Dock 7500, the dock appears to feature numerous ports, including dual Thunderbolt 5 connections that can provide up to 120 Gbps transfer speeds.