Hints are slipping out in every direction of the method used for filming The Mandalorian. This excites me because it eventuially all filters down to kids and folks who just want to make nice movies.
I'm sure Cinefex or someone will nail this and I can read it, but it appears that what they do is put the actors in a space, with large screens behind them, and the image on the screens moves to accommodate the camera movements so the illusion is complete.
Bill Burr called the experience "vertigo", which highlights the idea that these screens are in your vision at all time and you have to work around that. Like greenscreen work, it takes a certain element of actor to adjust to it.
I look forward to the breakdown.
