Shimano Releases Dura-Ace Di2

From the Shimano website: Dura-Ace Di2 for Time Trial and Triathlon

Recently we have announced the electronic road racing components DURA-ACE with Di2
technology. Now an important addition: electronic shifters especially for time trial and triathlon usage. These products eliminate the need to change hand position for shifting. The rider can change gears at the base-bar as well as at the bar extensions from now on. The direct result is saving time and a better concentration on the ride.
ST-7971 is the model number of the Dual Control Levers for time trial and triahlon. They feature a carbon lever blade that reduces the weight to 127 grams per pair. Compatible with the new FLIGHTDECK cycling computer with integrated buttons in the hoods.
SW-7971 is the model number of the electronic satellite switch that can be integrated easily into time trial bar extensions. The shift wires are guided through the bars for optimal aerodynamics.
Weight is 103 grams per pair.
These shifters are compatible with the new DURA-ACE Di2 derailleurs FD-7970 (front derailleur) and RD-7970 (rear derailleur). They will be available in the market around three months after the availability of the regular 7970 series.