I don't know if that's been said but I watched the stream where they mentioned that, if you go into a Campaign for a certain alliance, you would be locked to that certain alliance and couldn't use the characters you have in other alliances for that Campaign.
If that is correct, that means I'll be able to go into Vivec with my Blues, Sotha Sil with my Reds but won't be able to farm transmutes on my yellow unless I farm once a week in Shor.
I would have a suggestion if that is to happen. Why not make it that ALL your characters are locked to a specific alliance therefore not making some characters unusable in a campaign?
Did I miss something?