Shimano recently rejoined the world of electronic MTB shifting after a long hiatus with the release of its latest XTR Di2 groupset. The long overdue release sparked excitement through the MTB community as Di2 finally went fully wireless, although for most riders it was a tantalizing look into the future as they set to wait for the tech to reach Shimano's other MTB groupsets.
When Shimano first launched electronic shifting back when 11sp was cutting edge, it offered Di2 in both XTR and XT levels, so it was a safe bet that they would eventually do the same with the new wireless 12sp Di2.
