I just researched this recently as I was looking for the reason that as a confirmed Lutheran, I didn't know anything about the book of Revelations. I drifted away from the Lutheran church as it became more liberal. But I didn't remember any sermons about it, or reading any lessons from it - yet, so many evangelicals and others here in the South know so much about it.

Martin Luther translated the Bible directly from Greek and Hebrew texts into German, being careful to use the correct German so nothing would accidentally get translated incorrectly. He would go into town and learn the everyday German being used to ensure he was translating correctly. In the process of translating the New Testament, he didn't trust the content of 4 books and he put them at the end. He really doubted the contents of Revelations so it is last.

Apparently, the bible of the time being used by the Catholic church had been re-written over the years and was not true to the old texts. Thus, why he wrote a new version.