Urriak Uruk
Gaming is fun, and fun is for everyone
How much is Innistrad like Ravenloft? Is it good Gothic?
Innistrad is very gothic, and shares a lot in themes/tones with Ravenloft. There are certainly some differences, but there more similar than not.
Some of these were released as small free pdfs, I think they were maybe Zendikar, Kaladesh and either Innistrad or Shandalar. I wonder if this makes it more or less probable they will ever get a hardback supplement.
You are thinking of the Planeshift articles. They are released whenever an artbook is released for a plane; Ravnica also has an artbook, but no article because it has a harcover book released before.