Other World Computing (OWC) says the OWC Mercury Helios PCIe Thunderbolt Expansion Chassis (http://tinyurl.com/9l6j2yv) has been updated with Thunderbolt 2 technology. The newly updated Helios handles throughputs of up to 20Gb/s, bringing Thunderbolt 2 technology to the original Mercury Helios' throughput of up to 10Gb/s.

OWC’s Mercury Helios PCIe Expansion Chassis is a solution for using half-length professional-level PCIe 2.0 cards with Apple’s entire line of Thunderbolt enabled Macs that do not have PCIe slots due to size or design limitations. It's bootable with AHCI-compliant cards and can daisy-chain up to five additional Thunderbolt devices. Types of PCIe cards Helios can use include: Fibre Channel, 10GB Ethernet, RAID controller, video capture, digital audio, solid state drives, SAS controllers such as the OWC Jupiter, as well as FireWire, USB 3.0, eSATA host adapter cards.
 
The Mercury Helios PCIe Thunderbolt Expansion Chassis is now available for order at a manufacturer's suggested retail price of US$299. It will begin shipping within 7-10 days directly from OWC and select retailers.