"All of the features of ZFS and more are being built into btrfs"
That is not even possible, since ZFS is not just a filesystem but includes volume management as well.
"am looking forward to using btrfs on top of hardware RAID"
That is a very flimsy arrangement compared to end-to-end checksums and redundancy on ZFS.
As for the license discussion, this is a current topic on the ZFS mailing list, since a new ZFS porting project has recently been announced there.
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