When the news started to unravel, it struck me that the cosmology community was in the same position as someone waking up in an unfamiliar Las Vegas hotel room with a throbbing headache, hazy memories of the night before, and a fresh tattoo reading "r=0.2".
Unfortunately, once the initial excitement died away, a number of voices asked whether BICEP2's signal had a more humble origin -- dust in our own galaxy. Dust can mimic a gravitational wave signal if it interacts with the galaxy's magnetic field. From a cosmic perspective, anything inside our galaxy is a "foreground" – dirt on the window through which we peer at the microwave background, the fossil light from the big bang coming to us from the furthest reaches of space.
When it comes to the details, the stories diverge. Some claim a (relatively) large B-mode that could be hard to square with other datasets, or would imply that the early universe is weirder than we imagine. Other rumours tell of a signal that is consistent with everything else we know, but might permit only a more tentative detection.
Planning to live blog the Planck live blog data release tonight. In the meantime, read Renee Hlozek and Shaun Hotchkiss's blogposts which give good discussions of what is at stake, or watch Ed Copeland giving a quick survey of cosmology.