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If the examples are in C/GTK+ that means that as long as your language of choice has a runtime on (or can be compiled to) the Librem 5 CPU architecture AND has a binding to GTK+ available, that should "run", if my understanding is correct.

There is some beginning work being done to have libhandy wrappers in rust. I have gotten their qemu environment up and running and will be tinkering on rust+gtk apps which I hope has a future in this ecosystem.

But yea by default it appears most stuff is c and gtk right now.

It would be basically a Linux arm64 device, anything could be used. GTK+ is used by Purism for their default apps, but Plasma Mobile will be in their repo too. And you could install any Linux distro which supports arm64.