Yes, mastodon will add it. Currently the closest group they have is the forumverse and a.gup.pe.

Iceshrimp is a fork of firefish a misskey fork. But once they finish the rewritting it won't be a fork anymore.

Here is their roadmap : https://issues.iceshrimp.dev/issue/ISH-191/Magazines-support

And we know one of their dev. He is on the matrix group of jlai.lu and he confirmed working on lemmy and PieFed support. So by the end of this year we should see a tremendous activity. 😍