Board Thread:Questions and Answers/@comment-39736538-20190905204914/@comment-31797469-20191005143249

Too early to tell, but I hope so.

My personal guess (which is almost 100% speculation) is (Quad: Edamimi) for the next non-magical Fire Island. I think so because:
 * is a given.
 * and are so far the least used elements for new Islands.
 * or as the fourth element is less likely since those combinations would represent undiscovered Quads in DoF. This leaves only  as the final element.

Disclaimer: Every time I have done these kinds of predictions, I have been wrong xD