Was it really four months ago that Intel and Apple took the curtains off of Thunderbolt I/O? The MacBook Pro and iMac lines have since been refreshed with the interconnect, but early adopters haven't had much more than a fancy port to stare at. Thankfully, Apple's $49 T-bolt cable is finally available as your ticket to the 10Gbps superhighway. Apparently, it quietly hit Apple's web store this morning along with some fresh Promise Pegasus RAID enclosures ($1k for 4TB up to $2K for 12TB) to support it. All of the peripherals appear to be in stock and ready to ship; so if you've been eagerly waiting to make use of that extra port, now's your chance.
AppleiMac 27-inch with Retina 5K display (late 2014)