Pepsi marketing strategy: see what Coca-Cola is doing
Sram marketing strategy: see what Shimano is doing
Clutch rear derailleur:
http://www.vitalmtb.com/product/feature/SRAM-Leaks-A-New-Rear-Derailleur-Design,104
Four piston brakes:
http://www.vitalmtb.com/product/feature/SRAMs-New-Four-Piston-Brakes,105