Apple's Watch is designed to be both fashionable and functional.
Firewire Specification Approved For Speeds Up To 3.2 Gigabits/sec
Firewire 400 devices have become widespread in the computer industry, though the faster Firewire 800 specification has seen slower adoption. Currently MacBook Pros, Mac Pros, and iMacs each feature both Firewire 400 and Firewire 800 ports.
IEEE says the new standard is expected to be available in October.