New Materialism: Interviews & Cartographies, by Rick Dolphijn and Iris van der Tuin is now available, open access, online. Print and pdf versions to follow. The first half of the book has interviews with Rosi Bradotti, Quentin Meillassoux, Karen Barad and Manuel DeLanda. The second half is written by van der Tuin and Dolphin.
The series editor Graham Harman says a little more about the book and the series here.