Marco has a hard time seeing Apple dropping the Ethernet and FireWire ports in the 15″ MacBook Pro in order to obtain a wedge shape. ((Like what the current Airs have.)) What if Apple decided that USB 3.0 was the way to go, thus theoretically allowing a Gigabit USB Ethernet adapter and FireWire speeds?
I don’t know if you could do Gigabit over USB 3.0 and the standard is very new, but I do know that it is backwards compatible with USB 2.0 devices — you wouldn’t need any more ports.
Personally I think Apple ditches the Ethernet and platter based hard drives. Though USB 3 would be a compelling reason to get the ‘Pro’ lineup of Apple portables.