> AUR clients already show you the diff if you update a package, but note that this were completely new packages anyway, uploaded 2 days ago, so that doesn't really apply here.

The program I use for AUR (Rua) still displays exactly what you're about to build (as a git diff), before you build it, even if it's the first time/release. I'd assume all the other "AUR managers" would work the same way?