It took some time, but the paper co-authored by Lehtinen, Aila, Laine and Durand is finally out. I've been looking forward to this paper for a few months and it surely doesn't disappoint:
Aila and Laine (Nvidia research) are both geniuses when it comes to GPU path tracing, image reconstruction, SVO and GI in general and their papers are guaranteed to contain exciting (and reproducible) results. The paper includes some interesting comparisons between the new algorithm, the a-trous wavelet filter and random parameter filtering. Good stuff!