The eject button is on the F12 key. It does whatever F12 does when you press it. It's not like they added a F13 key, they basically did exactly what you're asking here.
F12 used to be volume up on my old MacBook, everything moved 1 key to the left and rather than F5 and F6 being blank (or used for the backlit keyboard), F6 is used for "rewind" and only F5 is blank.
Yes, key count wise it is. But they had to shift all the actions on the function keys to the left by one key to fit the power key in. The result is that there is only one empty key now (F5) and no longer two which were used for keyboard brightness. Also when you hit next (for iTunes) now you have to hit another key than you had to in the past (physically). I keep hitting the Eject / F12 key now...
What I would have liked them to do is really leave everything the way it is and just replace the eject button with the power key. Who needs an eject button on computer with no drive?
That's how you eject the SuperDrive since there isn't a button on the drive.
You can also drag the icon to the Trash, use the Eject menu button, press Cmd E, use the Finder menu, use the Finder sidebar, etc etc...
To me it makes no sense to have a physical eject button on a computer that has nothing to eject.
