That world will show up again. Silence probably won’t, but the world itself, yes. It’s called Threnody, it is one of the Cosmere worlds. There’s not a Shard there but there are interesting things happening. There’s actually been a character in other books who’s from Threnody. It will eventually be clear who that is, but they have shown up in many previous Sanderson novels.
Editor’s note: The character he’s referring to is Nazh, who works with Khriss gather ephemera and write the Ars Arcanum for each book