Shimano's Matt Robertson explains the new 2012 Shimano XTR Shadow Plus clutch mechanism that keeps chain slap at bay and helps the chain stay on the crankset. He also runs down the changes to their M780 XT group for 2012, which gives it the new IceTech brakes and a 2x10 drivetrain option. For pics and more info, check out Bikerumor.com