This release has countless new features over release 0.8, such as run-time detected GPU acceleration (switch it on/off during runtime in the prefs), blend operations, a spot removal tool, a low light vision tool, non-local-means denoising (relatively fast for nlmeans, but still slow), a framing plugin (adds postcard borders to match a given aspect ratio), tonemapping is a lot faster now (probably the fastest high-dimensional bilateral filter available today), changed images come with the darktable|changed tag, and many more. The first part of the Google summer of code project is already merged.
