Meh, FireWire 800 is already as fast as a 7200-rpm drive can take anyway. The only time you'll see speed advantages above FW800 is when you have an SSD in which case Thunderbolt will blow USB 3.0 out of the water.
Actually FireWire 800 would be bottlenecking any modern HDD. Modern 2TB HDD's have sequential read speeds of over 130MB/s (1050Mb/s), whereas FireWire 800 seems to max out at 75MB/s (600Mb/s).
http://macperformanceguide.com/Storage-Drive-SATA-vs-Firewire.html
This is ignoring the other problem with FW800 - its bloody expensive!
apple wouldn't necessarily HAVE to support usb 3.0 just because intels chipsets do, it's just a lot more likely since it won't require any additional controllers to support usb 3.0
They wouldn't have to, but it would be stupid if they didn't, considering they'll be paying intel for the hardware regardless. And given that USB 3 ports are also physically cross compatible with USB 2, apple would be loosing no valuable laptop space by integrating USB 3.
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