I came across the uAvionix EchoESX literature recently while doing some panel planning. Apparently, it was introduced at Airventure 2025 and was going to be available last summer. It's a full transponder (controlled by an AV-30 in your panel) along with ADSB out functionality. It is now being advertised on numerous avionics dealers websites as well as the uAvionix website. But it doesn't seem to actually be available anywhere. Everyone has it as "available soon" or "preorder." Does anyone have any updated info on this unit?