Entered contest on Duskwood. Was late so hadn't set hearthstone and only took second. Looted Dread Pirate Ring. Kept fishing as always to try and get rares. Fished up another 40, noticed with disbelief that no one had taken third.
Flew back, expecting another winner announce the whole time, and won the fishing line. So in one contest won second AND third place (assuming others gave up after first winner -- they must not have researched new rules -- but I also didn't check to see if they were from my server).
There were dozens of characters from other servers clustered around the turn in, chirping about whether or not someone had won. They couldn't turn in ahead of me, so Blizz did this right.
NOTE: only 2 prizes were offered to me as choices when I turned in for 2nd place and only 1 when I turned in for 3rd. So either there are three prizes and it's first come first serve, or I was only offered prizes I had never looted before. Guessing it was the former (three unique choices offered and you loot your choice in the order you win).
Finally... now have every piece of fishing gear (including Pandaren lure, exalted with Nat) -- fishing skill 600 + 220. Still irritated that Exalted with Nat gave a hat that replaced old one instead of a new slot like my forum-posted idea for "Bog Waders" or something that added to the gear instead.
Still wish exalted with Nat earned me the reward title Druantis the Master Baiter.
Thanks again for the much appreciated crowdresourcing advice to El and all the posters (hey I just coined some more jargon).