^Didn't the IRS already say yes
? Maybe i'm remembering wrong...
Either way. With the Typhon Pact already formed, the Ferengi, Talarians and Cardassians will probably say yes, just to shore up their security. They are all "friends" of the UFP by this point anyways. I guess we'll find out for sure in 15 months...
From what I remember Donatra's Romulans and the Ferengi agreed to attend, nothing more.
Personally I dont actually think many of the nations mentioned will join up anyway. At most maybe the IRS will forge a few closer ties, but I just dont see any of the others joining something so formal with the Federation.