Intel's Thunderbolt interface is pretty slick. It combines DisplayPort and PCI Express over a single cable with a staggering 40Gbps of aggregate bandwidth. Each Thunderbolt channel has 10Gbps of bidirectional bandwidth, and there are two channels per port. Those specifications refer to Intel's current-generation Cactus Ridge Thunderbolt controller. According to DigiTimes, a new Falcon Ridge chip will be released in 2014 with even more bandwidth on tap. Falcon Ridge is said to offer 20Gbps per channel, doubling Thunderbolt's total throughput.
http://techreport.com/discussions.x/23299
Thunderbolt bandwidth to double in 2014
24th July 2012, 08:12
Thunderbolt bandwidth to double in 2014 
