I remember reading about this long ago, and as I recall, at least at the time, they were planning to have cross-platform account access. i.e., you could start up your account initially on a PS3, but also log in from a PC (with the game installed). Contrasted to XI where if you created your account on a PS2, you would always and forever have to play with that account on a PS2. My impression was that they intended to allow you to, say, play on a PS3 at home, and then log in from work on your PC (not that you would ever do that >_>).
Has there been any new word on this? It seems like an important feature that may have been overlooked in all of the recent excitement about content.