Actually there has been a FAQ involving this on the news portal since the 17th.
http://en.allods.com/news/general/shard-merge-faq#
For Avatar Names:
No name change will be required if your character’s name is unique across the servers.
If there are two characters with the same name across the servers, the matter will be resolved in the following manner:
If a character has not logged in within the past 90 days, that character will be prompted for a name change.
If neither of the characters with concurrent names has logged in within the past 90 days, both of them will be prompted for a name change.
If both characters have logged in within the past 90 days, the character with the lower gear score will be prompted for a name change.
If both characters have logged in within the past 90 days and have an identical gear score, then the character created most recently will be prompted for a name change.
That being said, I will bring up the issues regarding the ease of use regarding the character rename once the issues regarding the account transfers have been solved.
-Wraith