I've read a little about them back when I was an Episcopalian (ECUSA). Lev Gillette, the Orthodox writer was a founding member. I'm not sure they can do any serious work given the radical changes in the Anglican Communion. Any chance of communion between Anglicans & Orthodoxy went out the window with the ordination of women in the 1970's.
Is the Fellowship a venture between Orthodoxy and the official churches of the Anglican Communion or with Anglicanism as a confession? If it's with Anglicanism as a whole, I suspect that there are some sizable portions of the Continuum, particularly those who participated in the Affirmation of St. Louis, with whom dialogue might be productive (as well as seeing many more en masse
conversions to the Western Rite).