GMC revealed the all-new 2018 Terrain on the eve of the Detroit Auto Show. The completely redesigned Terrain shares a platform, powertrain offerings, and other major components with the recently-introduced 2018 Chevrolet Equinox.
2018 GMC Terrain

2018 GMC Terrain

For the first time since 2009, GMC has redesigned the Terrain, their smallest utility vehicle. The all-new 2018 GMC Terrain is several hundred pounds lighter and will be built on GM's D2XX platform, just as the 2018 Chevy Equinox is.

The exterior features a redesigned GMC grille, wraparound-style windows, C-shaped LED lights on the front and rear, and a floating roof. While similar to the Equinox, the Terrain's stronger, more rugged look allows it to differentiate itself.
2018 GMC Terrain
We also see change under the hood, where the Terrain will offer three all-new turbocharged engines, including a diesel option.

The base 1.5-liter four-cylinder makes 170 horsepower and 203 pound-feet of torque, while an available 2.0-liter inline four-cylinder kicks up the power and delivers 252 horsepower and 262 lb.-ft. of torque. Both gas engines are paired to two unique nine-speed automatic transmissions.

Finally, a 1.6-liter turbo-diesel four is also available. It makes 137 horsepower and 240 lb.-ft. of torque and gets a six-speed automatic. GM estimates that the diesel could reach around 40 mpg highway.
2018 GMC Terrain
The interior has been redone as well. The most notable change is the lack of a conventional gear shifter. Instead, we get a new version of GM's Electronic Precision Shift that uses push buttons and pull triggers for gear selection.

In addition, both front- and all-wheel drive models get a Traction Select system. All models also get a 7.0-inch touchscreen display and tons of newly available safety technology, including a surround camera system, forward-collision warning, low-speed forward automatic braking, and lane-keep assist with lane-departure warning.
2018 GMC Terrain Denali
The 2018 GMC Terrain will again be available in four trims: SL, SLE, SLT, and top-range Denali (above). The Denali variant comes with plenty of exclusive features such as a satin chrome grille, chrome accents, 19-inch wheels, unique interior trim tint, a heated steering wheel, a power liftgate, and a navigation system.

The Terrain will go on sale in late summer 2017, with no official dates or pricing set in stone. The outgoing 2017 Terrain starts at $24,995 including destination, so expect pricing to start around there.
2018 Chevrolet Equinox

2018 Chevrolet Equinox

One booth over from GMC and the 2018 Terrain at the Detroit Auto Show, you can find the related 2018 Chevrolet Equinox on display. The all-new Equinox was (fittingly) introduced back in September on the autumnal equinox and made its public debut at the L.A. Auto Show in November.

This marks the first time since 2010 that the Equinox has been redesigned. It doesn't share a single body panel with the outgoing model and is also approximately 400 pounds lighter.
2018 Chevrolet Equinox
The 2018 Equinox shares the same platform, safety technology offerings, and powertrain options with the 2018 Terrain. The Equinox is the first Chevy model in North America to use an all turbocharged, multi-engine powertrain lineup.

However, it differs from the Terrain in several areas as well. The Equinox features different headlights and taillights, a less sculpted hood, a more traditional D-pillar, and a traditional gear stick.
2018 Chevrolet Equinox
The 2018 Chevrolet Equinox is set to go on sale sometime in the first quarter of 2017. However, both the 2.0-liter and diesel engine offerings will not be available until sometime during the second quarter of 2017. Pricing for the 2018 Equinox starts at $24,475 including destination.