ARR release date not there but thee is info on CE

[Nix]

Weird isn't it? They've already stated that your account can only be logged in on one system at a time.

Worst case scenario: *clicks* "You cannot do it. Even if you have bought two accounts, ARR will not let you run twice on the same machine."
Best case scenario: *clicks* "We have implemented a 'hot-switch' so that all of your characters can be active simultaneously and switch between them with the press of a button. In this way, you will be able to build your own party of eight characters to go adventuring with. In order to facilitate this, we have instituted a modified version of FFXII's Gambit system to run your characters with a set series of commands.

Hey, I can dream.

Dammit Mjollnir, that really does sound like a good idea Q_Q;