Oh, good question.
Han will be there, as will Umberto, the President of Brazil, one Dreyfus Sufe, of the SRA, sans credentials, the Prime Minister of Tibet, the PM of New Muskovy, General Anton of the Cossaks, a rep from Qin China, a rep from new Hong Kong, the King of Arabia, the Iranian PM, and a whole bunch of other people.
So lots.
As far as the embargo goes, no joiners yet. Nobodies exactly certain what they're doing that deserves an embargo.