Seems to have been patent-encumbered and largely abandoned in the commercial world, but there is a FOSS library called fiasco (.wfa files) that is included with netpbm, available on most *NIX systems.
New formats are generally a huge pain in the media worlds... Huge companies like Google have been trying to get webp for years and it's still not there, and it's also why they're still putting so much effort into png/jpg.
ehsankia|9 years ago