Want your GMC pickup or sport-ute fully luxed-out? Then the Denali line is for you. But if it's a hardcore off-roader you're looking for, you'll want an AT4 model. And GM's dedicated truck brand is expanding that particular line across its entire range (save for the Savana commercial van).

Following the debut of the new Yukon AT4 and Canyon AT4, GMC has now confirmed that it'll apply the same treatment to its compact crossover. And with the Sierra, Sierra HD, and Acadia already available in AT4 spec, the new Terrain AT4 will complete the lineup once it reaches dealers in the fall.

To preview the Terrain AT4's arrival, GMC released an image showing its soon-to-be full AT4 lineup - including the compact crossover (pictured in between the larger Acadia and Yukon).

Unfortunately it's said very little else about what will differentiate the Terrain AT4 from the standard and Denali versions (pictured below in dark grey and red, respectively). "Terrain AT4 will feature a rugged exterior, confident capability and advanced technology" is about the sum total of what it's disclosed so far, but we can expect this model to follow closely along the lines of the other AT4 models it's released to date.

"AT4 continues GMC's bold entrance into the premium, off-road and adventure- oriented truck and SUV space," said GMC marketing chief Phil Brook. "For each of the AT4 variants, we listened to our customers and made sure the vehicles met their active lifestyle needs."

That typically includes added off-road capability and a bolder, more rugged design approach encompassing black chrome exterior trim, aluminum interior accents, and fabric upholstery more upscale than the standard fare (though not as luxurious as a Denali's leather). GMC says that Sierra sales increased by 14 percent last year, and the AT4 version released last year "played a huge role in that growth."