The following official statement has been issued:
Statement from the Secretary General of the Anglican Communion.
That page has a link to the audio of the press conference.
There is also a PDF file containing all the correspondence.
Report from Anglican Journal Uganda primate protests decision to disallow delegate to ACC.
Anglican Mainstream has this account from Chris Sugden Report from ACC-14 Day Three: The Anglican Communion Covenant and Uganda’s right to choose its delegate.
And there is a report from Uganda, Uganda People News: Orombi writes to Williams as row in the Anglican Church widens