what is the differences in the 2013 & 2014 Denali?

most likely the only difference will be cosmetic, and price.

Malz, The 2014 Yukon Denali will no longer have the Carbon Black Metallic or the Dark Blue Metallic available. Convenience package is also deleted. All content is now standard on the SLE. Changes include: *No Hybrids available for the 2014 MY *Remote vehicle starter system now standard on SLE models *Mirror, inside rearview auto-dimming with rear camera display, now standard on SLE models *Power-adjustable pedals now standard on SLE models *Rear Park Assist now standard on SLE models *Rear Vision Camera now standard on SLE models Erica Tiffany GM Customer Care