I don’t think this group is the right place. Yes, there is a lot of progress being made. The effort is being led (as of this year) by the European Digital Reading Lab (EDRL) (
http://edrlab.org/edrlab/), which is a joint venture of the IDPF, Readium and funded largely by the French government. The CTO of the Lab is Laurent Le Meur <
laurent...@edrlab.org> I would suggest you reach out to him.