WebP only seems to support 8-bit integer component values, which makes seems pretty backward for a new format. Higher-bit depths and floating-point components (ala OpenEXR) seem an important feature for any image format that hopes to become a future standard. 8 bits were maybe sufficient in 1990; not so much today. Even microsoft eventually got that clue with JPEG XR... You only get so many chances to define a new st…
It look like Mozilla is considering JPEG XR support: