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Got mine today, 1.32 CET on Nemesis server, using one of my regular alts (no DK trick). I logged in and there were 3 Minfernals, 2 poor and 1 rare. Immolatus (the rare Infernal Sentry) was walking around, so maybe its related... maybe not.
EDIT: two more spawned a few minutes later (1 Uncommon), Immolatus still around. So I tried following him for nearly 30 minutes... nothing happened and no more Minfernals appeared.