Just look at the Brewfest epic items, and you likely have your answer.
Historically, Brewfest is a pointing stick to how these things turn out.
That said, the Brewfest trinkets do proc Terts. Since we know that they drop within the same rules as any other dungeon, it's safe to assume the Rings will aswell.
Worst case scenario, they won't. Wich probably won't matter much, since they're still worse than WoD-epics