All I could afford wrote:
At the risk of being considered the youngest old-fashioned guy, I would much rather have the familiar, simple, proven naturally aspirated gasoline V8 engine even if it was rated at less horsepower and torque.
I tend to keep a vehicle till the very end, rarely if ever under warranty. My whole business model depends on being able to research common problems and solutions both on the Internet, and from trusted local mechanics.
Good, sound simple logic there. And while I'm not afraid of technology, I don't need to have it unless there's a clear advantage.
If the mpg reports of the new 2.7 are wrong and it gets notably better mileage than a 5.3 (and of course is reliable) then it is the right choice. But currently the manufacturers mpg ratings and the "other" tests don't support that.
So what is the advantage? Not better fuel economy, not lower purchase price, not lower maint/repair cost (supposition on my part but likely true) and you can't even open the hood and brag about your engine cause it looks like a little rice grinder!
Not meant to disparage the OP's purchase, just don't see the advantage of it.