Looks like Andrews McMeel is putting out an OZ 5E compatible setting Book.
OZ - Andrews McMeel Publishing
Adventure is just down the Yellow Brick Road… The award-winning author and illustrator of Neverland returns with another beautiful RPG setting book, in OZ: A Fantasy Role-Playing Game. While many have traveled with Dorothy Gale to the world of OZ, there is so much more to explore! But know this...
publishing.andrewsmcmeel.com