From the dialogue that Mark Hamill is stating as Luke Skywalker, "I only know one truth, that the Jedi must end." I believe that is being used out of context to create surprise among the vast majority of viewers who are not well versed in Star Wars lore.
My best guess that the "change" is the move from the 'monk' model of a Jedi who walks in the light as opposed by the Sith who walk in the Darkness. Abandoning the moniker of Jedi for a new way of being a Force wielder.
A Force wielder who uses all aspects of the Force. What they call a Grey Jedi. I assume that the script writers will coin a new term for the movie.
The monk way is what led to the downfall of the Jedi. There are YouTube videos explaining that.
This will be a good direction for better stories down the road.
