One part is correct there namely the increase seen in air flow with the thinner cables. However despite seeing a faster bus the ATA100 hardware limitations are still seen with the average 7,200 sata model. That's why many go after the smaller capacity WD Raptor models seeing a 10,000rpm over 7,200.
The next stage for hard drives however will not seeing faster spindle speeds due to the physical limitations of the current form of hard drive. A totally new type of storage medium is one thought while the next version of Windows may see a totally new method for file indexing on the current types of drives available. But for now that's strictly rumor until an actual MS release is seen.
For the most part the main differences are cable type and some differences seen with the controller cards on the drives themselves for the 7pin cable over the long outdated ide standard of 40pin/80conductor seen there. The spindles, spindle motors, and magnetic platters in the drives themselves remain the same inside the same basic 3 1/2" housing.
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