No disc brakes for 2015, the frame seems unchanged other than the paint (and no panels for this year).

MTB crankset (44/32/22) was changed to a trekking (48/36/26) crankset.
RD was changed back to Shimano with Microshift shifters.
Cassette changed from 11-32 to 11-34 (and to Shimano as well).
The SRAM chain was replaced with a KMC chain (eliminating the last SRAM part).
Continental tires were changed to Schwalbe.

The braking system remains unchanged.