Let’s see, in no particular order… * New pretty continuous color schemes (viridis, rainbow, ColorBrewer) * New axes that are easier to use. * Vastly improved

Let’s see, in no particular order… * New pretty continuous color schemes (viridis, rainbow, ColorBrewer) * New axes that are easier to use. * Vastly improved circle-packing layout. * More stable, extensible force layout. * Cleaner implementation of immutable selections & transitions. And a ton of other stuff. Taken overall, it feels like a big step forward in robustness and cleanliness. And I’m hopeful that it’ll be easier for folks to develop more D3 modules.