So I got me SE security yesterday, and the thing is a dead on match for the blizzard authenticator. Only difference is the face plate says Square-Enix instead of Blizzard. They use the same format for serial codes, and apparently come from the same manufacturer, so I'm wondering if you could use them across games.
Also, for anyone with multiple accounts, you can't log in simultaneously using a single one time password. You have to log your accounts in one at a time. This is in contrast to WoW, which lets you log in as many accounts as you have connected to the token as long as the password for the 30 second period hasn't expired.