By brother sent me a Reddit post (I know) but without clicking it I was able to read the title and I bit of the description :D
Anyway, it basically said to follow rats in dungeons and they bring you to good loot. Ignore the predetermined dungeon path and just follow the rats.
I haven’t tried this myself but just wanted to share real quick!
Diablo IV Players Are Following Rats To Find Good Loot
So it is a thing! Cool
It does appear to just quote the same Reddit post and say that there’s nothing else to really go on so far.
We need lemmings to try it!