Nothing would change about the community itself if it goes from lemmy to sublinks. Still accessible on the federation as normal and on version 0.1 the core features should have parity
Reposting my comment I did before:
Sublinks is a drop in replacement for lemmy. In version 0.1 nothing should really be different between the two apart from the default UI looking different
For world Ruud commented about that before and nothings been decided currently on theyre going to handle it (I assume youll see some sort of post in their meta community way before anything happens)
Rather than being limited to posts themselves it probably makes more sense to attach it to certain chunks of something. For example a block of code so that people copying the code to use in their own projects after receiving help actually have the license to do so rather than that just being verbal (could make it default to MIT No Attribution or some other license the community specifies). This same logic can be extended to images (although probably with no default for those since theres way too many possible cases)