Interesting...
I've been doing a bit of research into W2012 recently (I work in backup/storage, so need to know it) and it's interesting that MS seem to be offering a lot of what would be classically considered "Array functionality" in the OS - such as replication, disk pools shared between servers, dedupe, online spares, mixing of RAID/Protection levels in pools, sharing of filesystems between servers. This is an interesting development as it will certainly put the wind up the medium sized array manufacturers - why would someone purchase functionality from them if it's available at the OS with jbod arrays?
Also, from a backup point of view - if the filesystem can dedupe itself, why would you license the dedupe functionality in your backup product or array? Better still with 2012, you can dedupe files which aren't used and keep the ones which are used fully inflated.
All pretty interesting...