HA Team!!!11 How dare you!?
I received my ZBT-2 today, unboxed it, put everything (two parts and a cable) together and plugged it into my Home Assistant Blue.
Beside an issue with Firmware Install via HA (see ZBT-2 Error - Zigbee firmware failed to install, check Home Assistant logs for more information - #6 by pschneider87) everything went smooth.
My ZigBee Network now runs on ZBT-2, my old ZBT-1 is now providing Thread.
After 5 minutes, everything is up and running, I don’t see any issues and nobody at my home complained about something not working properly.
This leaves me with only one question: what to do now? 
I was excited for a weekend of tinkering and debugging, and now, after 5 Minutes, everything is done.
Anyways, thanks to the HA Team for such a smooth experience. I’m excited to discover how ZBT-2 hopefully improves my Zigbee Network!