Supercruise order code still talks about 'late availability'.
UKL
Super Cruise, a hands-free driver assistance feature for use on compatible roads, includes automatic lane changing and trailering capability, 3-year subscription
1 - Late availability. Included with (RFP) Denali Reserve Super Cruise Package. Requires T*10543 model and (CWM) Technology Package. Not available with (L84) 5.3L EcoTec3 V8 engine or (PEC) Denali Reserve Package.
2 - Late availability.
1 -- Denali
2 -- Denali Ultimate
(it will be optional on Denali and standard on Denali Ultimate, and optional on 1500 High Country)