Annual Reviews, in a press release:
Today, the leading nonprofit publisher Annual Reviews announced that over the next 18 months they will make their entire portfolio of 51 academic journals freely available to everyone under a new model called Subscribe to Open. These highly cited journals cover topics across the sciences, including astronomy, environmental science, genomics, marine science, public health, and sociology
Annual Reviews, together with Berghahn, ran the first round of S2O pilots last year. They apparently went well.