OP, to answer your question, when Green launched they stated that if you have more than 8 chars between the two servers on the same account, when they merged you'd only see the first 8 characters (I believe it's in alphabetical order). In order to access the additional characters, you'd have to delete some of the 8 characters that were shown on the character select screen. This was a limitation with the Titanium client IIRC.
Who knows if they'd be able to code a workaround in. Point being at the time of launch (and today still I believe) it's unknown if that would be possible so it's better to make sure you're not creating, say, more than 4 characters on Blue and more than 4 on Green on the same account.
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