QNAP's JTB-400: A BYOD 4-bay Thunderbolt Enclosure
 

Ahh, finally what I've been asking for: a 4-bay Thunderbolt enclosure that allows you to bring your own disks. I'm reserving excitement until I see just how much QNAP's JTB-400 is going to be, but for now I'm cautiously optimistic. The drive bays are hot swappable and can accommodate both 2.5" and 3.5" form factors. The chassis doesn't feature any hardware RAID controllers (Marvell is on SATA duty internally) so you'd have to rely on software RAID but it should be cheaper than Promise's Pegasus R4. The JTB-400's release is set for sometime in the next quarter.

http://www.anandtech.com/show/5956/q...bolt-enclosure