Right now, I'm feeling concerned and wondering what is going on in regards to Sublinks here, since I have created a community for discussion on koalas about a week ago on here and have started and been doing work on it recently. But now I'm hearing about Sublinks and feeling concerned if I created it on the wrong instance or the wrong platform since I'm now just recently hearing about it. I'm just feeling worried and wondering whether or not if I should do anything or not.
That's not entirely true. The default UI for Sublinks is being developed to be dramatically different than the default UI for Lemmy. It's unclear if the Lemmy UI will be made available by lemmy.world if they change to Sublinks. Its also unclear if lemmy.world will simply redirect to sublinks.world.
It's also unclear if lemmy.world will use sublinks as sublinks currently doesn't exist in a form that's usable for lemmy.world. And it may turn out that what is built doesn't work as intended and lemmy.world will continue to use lemmy indefinitely.
It's planned to be 100% API compatible with Lemmy, so you'd be able to use any Lemmy-UI with it. IDK why LW or any other instance would change their default UI.
A lot of things are not final and may change, but let's just start with their stated goals, instead of speculating about all the things that could theoretically happen.