Has dust clouded the discovery of gravitational waves?

It's almost three months since a team of scientists announced it had detected polarised light from the afterglow of the Big Bang. But questions are still being asked about whether cosmic dust may have clouded their discovery. The latest, and most damning, piece was in Nature News last week. What made the original announcement from the Background Imaging of Cosmic Extragalactic Polarisation (BICEP2) team so exciting was that the twisting pattern on the sky could be caused by gravitational waves.