[ugh]

All Macs except the low end plastic MacBook and the MacBook Air have a FireWire 800 port. So, no. (Also: Why would they dump FireWire without a replacement in place or even just the lab?)

This will probably replace FireWire sooner or later.

[dpapathanasiou]

This is what I meant, but thanks for your downvote anyway: http://www.wired.com/gadgetlab/2008/10/apple-quietly-k/

[robin_reala]

A simple pin-adaptor turns a FW800 port into a FW400 port - they’re electrically compatible.