Dear Photoshop Team (as well as the Illustrator and Edge Tools Team):
The format improves upon .jpeg and .png use cases today while at the same time providing 2x-3x smaller file sizes at the same, comparable quality settings.
According to the image specificaitons, "WebP supports lossless transparency (also known as alpha channel) with just 22% additional bytes. Transparency is also supported with lossy compression and typically provides 3x smaller file sizes compared to PNG when lossy compression is acceptable for the red/green/blue color channels" (https://developers.google.com/speed/w...).
Being able to used on the latest Android devices an the latest versions of Chrome and Opera (I know they both use Blink, and thus it isn't a surprise that both support it already), according to caniuse.com, it is sort of reasonable to consider I think.