I'm waiting to see how the RAID situation with NVMe pans out. Intel is telling everyone to just use software RAID, which is of course what you have to do when there's no hardware solutions out there, but is that really the best option? Sure, it's perfect if you're using ZFS (ZRAID) anyhow, but is it really as reliable and manageable for everyone else? I know, if you absolutely NEED the speed, you do whatever you've got to do, but plain SATA/SAS SSDs are only a slight bottleneck for us as of yet, so I'll wait and see how it develops.