1- Macosxrumors.com just make up stuff as they go. Stop reprinting what they write.
2- 1 Firewire port is what's currently offered on the PowerBook, this is nothing new. One of FireWire's greatest asset is that you need only 1 port as all devices are hub-able.
3- FireWire is NECESSARY. Without it, no video editing (err, iMovie, Final Cutm hello? Apple is king here!). Also, you can boot off of a FireWire drive, you can connect 2 Macs in target disk mode to transfer file in a super easy way (that's what Apple use in Tiger when you launch a new Mac for the first time!).
Also, it's despite what the on paper numbers claimed FW400 is faster than USB2.0, to say nothing of FW800 which allows you to run uncompressed HD from an external drive (1 stream) in real time!
All these things make FireWire far.... FAR superior to USB2.