This new file system sounds awesome. I hope it will perform as expected.
The data striping function sounds a lot like Drive Extender that was removed from Windows Home Server. If so, I'm glad it's going to make a comeback. Drive Extender was one of the best reasons to use Windows Home Server. It made all of your disks into one big storage element. If a disk fails, just pop in a new one and it will become part of the collective. Want to add more storage, just connect another drive. No more need to worry about drive letters and partitions.