I don't think it was announced but one of problems which appeared after the
Thalia merge
Known issue: Former AU accounts will currently be prompted for their secondary password everytime they go back to the character selection screen.
seems to have been fixed recently.
This affected not only the accounts moved from Thalia but also all other new accounts. After a while, this was really annoying - great that it has been fixed

(I haven't started a new account now, but I've just noticed that on the account created after the Thalia merge I can now switch toons without being asked for the password each time. So I'm assuming that it will be now the same for any new accounts as well.)