I showed my dad a photo of both the 2019 1/2 ton and the 2020 HD. He has had one of the last 5 generations of GM truck (one was a GMC, the rest Chevrolet). He thinks both a god awful hideous and will remain in his current truck (2015 2500 6.0 gas) for the foreseeable future.
So Chevrolet has decided to offer a turbocharged 4 cylinder in the Silverado and surprisingly, it doesn't seem half bad. It's entirely new and produces 310 horsepower at 5,600 and 348 pound-feet of torque from 1,500 RPM which stays flat through to 4,000 RPM.
A small 4 cylinder engine will lean really hard on the turbo to keep those power numbers, so it will consume more fuel to do it. A turbo V6 makes more sense in my opinion. The base engine should be a NA V6, with the next engine up being a Turbo version of the same engine.
If you are buying a truck, and you actually work with it, a V8 just makes sense. If it is a street queen that only hauls kids or groceries(this would include SUVs based on a truck platform), then a V6 is generally more than adequate.
At this point in time, I am waiting for an EV truck. For most of what I do, a Rivian would be more than what I need.