PC Perspective has published a review of the new 1TB Western Digital Caviar Black HDD with SATA 6Gbps interface. This is the first HDD with the new interface, but it doesn't really seem to be worth it yet as it's more expensive and delivers only negligible performance gains.
The WD1002FAEX joins a long line of excellent drives from Western Digital, and seems to be as good a time as any for bumping up the interface throughput. Hopefully the push to SATA 6Gb/sec will help drive adoption of this new standard across the rest of the industry. That said, it did little to boost performance of this new drive. We may see better improvements down the road, but we are currently stuck with third party controllers for this speed grade.