Good news!
It appears that the Extreme Off-Road Package will now be available on at least the EV3X, and perhaps the EV2X as well. Previously only confirmed for the Edition One, it seems that GMC realized that they needed this package to be an option available well after the Edition One was gone.
gmauthority.com
For reference, here's the definitive options list prior to today for each trim level:
It appears that the Extreme Off-Road Package will now be available on at least the EV3X, and perhaps the EV2X as well. Previously only confirmed for the Edition One, it seems that GMC realized that they needed this package to be an option available well after the Edition One was gone.

2023 GMC Hummer EV To Offer Extreme Off-Road Package
Upping off-roading chops for midrange trims.

For reference, here's the definitive options list prior to today for each trim level:
Model
MSRPEV2
$79,995EV2X
$89,995EV3X
$99,995Edition
One
$112,595Availability Spring 2024 Spring 2023 Fall 2022 Fall 2021 Motors 2 2 3 3 Power (hp) 625 625 800 1,000 Wheel torque (lb-ft) 7,400 7,400 9,500 11,500 0-60 mph (seconds) tbd tbd tbd Approx. 3.0 Estimated range (miles) 250+ 300+ 300+ 350+ Fast charge capability 400 volts 800 volts 800 volts 800 volts Fast charge speed n/a 350 kW 350 kW 350 kW Four-wheel independent suspension S S S S Front e-lockers and virtual rear lockers - A A S Heavy-duty ball-spline half shafts - A A S Full Underbody Armor - A A S Steel sliders and skid plates - A A S 22-inch wheels S S S S 35-inch OD Goodyear Wrangler All Territory tires S S S S 37-inch OD tires A A A A MultiPro Tailgate S S S S Infinity Roof S S S S Rear Drop Glass S S S S Super Cruise (with trial period) S S S S HD Surround Vision S S S S Bose 14-speaker audio system S S S S 12.3-inch Driver Information Display S S S S 13.4-inch infotainment system touchscreen S S S S Digital Key S S S S Adrenaline Mode S S S S One-pedal driving S S S S Regen on Demand S S S S GMC ProGrade Trailering Technology A A A A Four-wheel steering - S S S CrabWalk - S S S Adaptive Air Suspension - S S S Extract Mode - A A A Adaptive Ride Control - S S S UltraVision with underbody cameras - A A S Torque Vectoring - - S S 22-inch Premium wheels - - S S Watts to Freedom Mode - - - S Extreme Off-Road Package - - - S Infinity Roof with Modular Transparent Sky Panels - - - S Exclusive Interior Badge - - - S Lunar Horizon themed interior A A A S White exterior paint - - - S