When running dism /Get-Features agains the Windows 10 WinRE.wim, there is a Feature Pack installed called WinPE-WiFi. You won’t find this in Boot.wim or ADK WinPE.wim, or as an ADK Optional Component.
Feature Name : WinPE-WiFi State : Enable Pending
So what can we do with this? Apparently if you have Wireless Drivers installed in WinRE (they are there by default for Surface Pro systems), you can use wireless with a few easy steps.