It's bringing the function and technology inherited from recent ground breaking updates to Dura-Ace and ultegra to the 105-Di2 platform.
It comes with semi-wireless shifting and 12-speed gearing advancement
The new 105-Di2 group set weights of 3068 grams (without a bottom bracket) and the pricing is currently slated to be near about $2000
It offers an expanded gear range with a new 11-36T cassette that gives a rider lower than 1:1 low gear.
The new low gear makes 105 more competitive in gear range with SRAM's Rival eTap AXS.