Some automakers will debut new options by themselves, offering them up to buyers across a variety of trim levels. Other automakers -- like Chevrolet -- dress up new offerings as part of a larger package that includes aesthetic updates and other features. That's why the automaker's new storage solution is lumped in as part of the new High Desert package.
The new feature in High Desert, which is available on three different trims of the 2017 Silverado -- LT, LTZ and High Country -- is a storage system that installs over the bed. This lockable system adds both side storage bins and a hard tonneau cover with a movable cargo divider. It also bequeaths a set of sail panels that hark back to the Avalanche, if you remember that thing.
Another first included with High Desert is the application of GM's positively excellent, otherwise known as Magnetic Ride Control. Magnetic fields alter the properties of iron particles suspended in the shock absorber's fluid, allowing the suspension to adjust its damping on the fly. It's like magic. I absolutely suggest trying it if you have the chance.
Depending on your choice of trim level to which you apply the High Desert package, you'll also get 20- or 22-inch wheels. High Desert comes out in the fall, and while Chevrolet made no mention of price, I think it makes a case for itself based on the suspension alone.