Anglican Mainstream has published a Signatories to A Covenant for the Church of England, and a Questions that may be asked document. Both can be read here.
These are preceded by the following comment (which itself raises an unanswered question):
The signatories to “A Covenant for the Church of England” are now being made public together with some background explanation. Although it was our original intention to publish the list of signatories and the “Questions that may be Asked” at the same time as the Covenant, we have withheld them for one week at the request of Lambeth Palace. We are publishing them now in the hope that they will help people to understand the full context in which these conversations have been begun.