JPEG XL (.jxl) is a new responsive and universal image format proposal. @jonsneyers’s FUIF is one of the proposals in review by the JPEG standard group #ImageCon2019
Actually lossless jxl can do any integer bitdepth up to 24 bit/channel effectively, including e.g. 10, 12, or 14 bit. It can also do lossless float up to 32bit/channel (including bfloat, float16, fp24 etc).