you know what? i am confused, too. very confused. the new mac DOES have a firewire, it is between the ethernet hole and USB hole. it has a little firewire symbol on it, and when i go to the About Me it says there's a firewire online and ready, waiting to burn through all kinds of stuff. if that's not enough for ya,
http://store.apple.com/us/browse/home/shop_mac/family/macbook_pro?mco=MTE3MDE scroll to the bottom and see it is still listed.
so, what fits in it? good question. the typical firewire cable won't fit in that strange hole. this thing is square, and inside it looks 'inverted.' have they changed the firewire plug? it's really weird. someone solve this caper. tell me where i can buy a new macbook pro firewire cable!
p.s. see this image? this is NOT what goes in that hole:
http://www.techfuels.com/attachments/other-peripherals/4328d1217331464-relight-firewire-firewire.jpg