Green Ronin is bringing back one of their best 3rd era books, The Book of the Righteous. It's being updated to 5E and there's a kickstarter going on now. The original was a very detailed plug and play mythology. The update will be similar, just with the 5e design scheme in mind. If you want to get a taste of the writing, check out this sample chapter of the original. I am rather excited about this project and am backing it at the Justicar level (print and pdf). The project is currently just shy of reaching the halfway to funding mark. If the project sounds cool to you, check it out.