I had the opportunity to try it out myself in the meantime and I can report that using Cubase iC Pro connected via WLAN to a machine that was already connected to a LAN via Ethernet caused no problems at all. 
I had the opportunity to try it out myself in the meantime and I can report that using Cubase iC Pro connected via WLAN to a machine that was already connected to a LAN via Ethernet caused no problems at all.