Having spent some time recently on storage products and what some of current storage systems can provide below is my wish list for the future.
Snapshots
Thin Provisioning
API
FC/SAS/SATA Disk support
FC/iSCSI/AoE SAN support
NFS/CIFS support
RAID-6/RAID-DP (I would prefer this to be software based, eg NetApp, ZFS, Linux)
No limitations (beyond performance limits) on the number of LUN/Disk groups/Volumes or any [...]