The short answer is that no one knows for sure, and if the devs wanted to tell us they probably already would have.
What I will say though is I see two reasonable options. The simplest is simply to give people new EQ Emu accounts. If I've got a "Loramin" account with 8 Blue characters and 8 Green characters, at the end of Green the devs just make a new "LoraminFromGreen19" account, and move all of my green characters onto it.
If I have a character named "Loramin" on Green, but I already have Loramin on Blue, the system could rename the Green one to "LoraminGreen" or "LoraminX" or something, and then I could petition to be renamed to something better in-game.
The only alternative to that I see ... short of the staff to creating an entire web-based admin or something to let you control your characters/accounts ... is for them to just say "we will move characters, in the order they appear on your Green character list, into FREE SLOTS on your Blue account only". In other words, if I have 8 Blue toons, I can't migrate from Green: I have to delete a Blue toon first, and then I also have to delete all of my other Green toons to make sure that the one I leave is the one that gets transferred.
(Again, duplicate names would get X's or something.)
But since the first one strikes me as the easiest and best for everyone (short of the "move your characters around using a web admin" dream), my money would be on that.
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