The accounts can be signed up anywhere in the world... i think its a purely american/canadian release atm simply because this is where thier main servers are.
As soon as som europeans servers are up wouldn't doubt it got back to the UK, but knowing Enix & Sony my bets would be on 3months time
PS2 version is due for a world wide release apartently, but I not sure becuase i can't find any informatino about it other than it'll work on the same servers.
The game is the most expensive MMO i've seen in a while though.
$45 for the game, $12/month ... $1/registered name
compaired to TheSimsOnline which is $50 inlcuding 3months free + $10/month per account (which can have upto 3 characters). But the Accounts cover all thier online games.