@skoll @dokidoki @dirb @awg I guess for a team that implemented animated GIF and WebP already, WebP-A shouldn't be too much of a challenge. I'm arguing myself into the view that maybe it does have merit. :-)
WebM/Matroska (or any of the modern A/V formats really) has features for stream multiplexing, resyncing when skipping into the middle of a stream and other features that probably don't make much sense for 2 MB animation files.
In other news, TIL about https://en.wikipedia.org/wiki/JPEG_XR /via https://bugzilla.mozilla.org/show_bug.cgi?id=856375 .