.BPG is the new image format.
It is posed to replace the .jpg
For those interested in looking at the results check this out http://xooyoozoo.github.io/yolo-octo-bugfixes/#nan-lian-garden&jpg=l&bpg=s
Here is link to a free Windows program that will help you convert your pics http://www.romeolight.com/products/bpgconv/
So while the format is recognized, you will find a lot of issues with implementation.
Keep an eye out for this exciting development.