James Heald posted a message about IIIF on the wikimaps list, see https://lists.wikimedia.org/pipermail/wikimaps/2015-February/000010.html . Created this task to keep track of it. The standard looks pretty basic so probably not that hard to offer.
Base info at http://iiif.io/ . Api info http://iiif.io/api/image/2.0/ . Daniel already did a (partial?) implementation (example: Chicago.jpg, see ZoomViewer links). The schema is "{scheme}://{server}{/prefix}/{identifier}". Would make sense to make an iiif project so we can server at "http(s)://tools.wmflabs.org/iiif/<filename on Commons>"
If we like the way this work we could also set it up as a production service in the future to be used by other tools (mediawiki api extension?)