The spectrum of one of the planets orbiting HR8799, which is about 130 light years away, shows that not all giant planets behave as they're supposed to. Turns out there is a class of giants which maybe dustier than usual and appear hotter as a consequence. Based on the conventional models for giant planet formation, this particular planet should be about 400K cooler than the 1200K they measured. However, when the models were corrected for a much dustier, cloudy atmosphere, the models agreed far better with the data.
Hopefully, they'll be able to get better data as time goes by and also begin to get spectral data from more examples of planets orbiting other stars.