My local PBS station is playing the Masterclass episodes right now, a Christmas one right now and they are not in the tent and then Masterclass 1, 2, 3 and 4 are following.
I didn't see a Christmas Masterclass. The one I saw was the same technicals and signatures as the regular season, with quite detailed explanTions (like, preheat at x temperature, bake at y for so and do minutes, then bake at y temperature for do and do minutes.