An Interesting Future-SAN
I wonder if this, with some improvements, could act as an acceptable standardized SAN platform.
If these disk were to be made with dual ports, and preferably POE powered, you could then add a few bog standard servers with 10GB cards which act as the "controllers" for the iSCSI/FC fabric, or even direct NFS/SMB filer frontend.
Theoretically you could build a reasonable san with a couple standard ethernet switches, servers, and these ethernet drives which if talking to a standard, would let you be vendor agnostic at any of the individual stages.
Nonetheless, I believe we will see some creative uses for a directly attached ethernet drive in the next few years.