Don't worry, I think there is absolutely no mention of it on any article covering the new iPads.That last item is a good point. Like the iPhone X getting taller but not really wider (in UI scale). I keep forgetting about that. This would mark the first aspect ratio change in the iPad ever! Finally. This will be great for users like me who like the smaller form factor but wish we had more room for toolbars and things in various pro apps.
I think it will be a great change, and really makes sense given the iPads positioning and usage now. I do hope that given the extra RAM, they will allow 3 app split view which would allow for 4 apps on screen at once (1 floating window).