A US patent uncovered by tipster @Underfox3 indicates that AMD is working on a hybrid computing design that appears similar to ARM's big.LITTLE architecture, with high performance cores paired to power efficient, low-power cores.
https://www.notebookcheck.net/Is-this-the-future-of-AMD-s-laptop-CPU-design-AMD-files-patent-for-hybrid-computing-approach-similar-to-ARM-s-big-LITTLE.484832.0.html