If I remember, it was pretty much confirmed when they announced it a few years ago.
As far as I know, only HD 189733 b, HD 149026 b, Ups And b and HD 209458 b have been studied really indepth (and I think a TrES planet, too, but not to this level of detail). In all honesty, each of them seem unique in their own right.
I'm not sure if Ups And b is truly an oddball. You're right in that it's unique about being the only known planet that is poor at heat redistribution. Maybe this happens in 25% of hot Jupiters? Maybe 1%? We need more information, really.
As for proposed mechanisms, I really don't know. I haven't been keeping up with hot Jupiter atmospheric modelling over the past year.
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