There's a bunch of nice little detail changes too besides carbon & stiffer.
* push through routing for derailleur housing
* built in brake hose clips
* better fit for stay protectors (less peeling)
* IGUS bushings at stay pivot
* 8x30 rear hardware (can use Fox & RS roller bearing hardware now)
* no more 3mm dish on rear wheel
* SRAM UDH
* 180mm post mount
* push through routing for derailleur housing
* built in brake hose clips
* better fit for stay protectors (less peeling)
* IGUS bushings at stay pivot
* 8x30 rear hardware (can use Fox & RS roller bearing hardware now)
* no more 3mm dish on rear wheel
* SRAM UDH
* 180mm post mount