Principled BSDF: new Alpha and Emission inputs for easy transparency and emission. Normal map baking now uses the antialiased baking and AA samples when there is a bump or bevel shader. Normal map baking now supports baking of bump nodes plugged into BSDFs instead of the displacement output. This can for example be used in combination with a color ramp, to randomize the hair or particle color. Hair Info and Particle Info nodes now have a Random output, which is a random per hair or particle value in the range 0.1. Rust blended into corners based on AO (model by Emiliano Colantoni) Shader Nodes Distance: distance to trace rays and detect occlusion. Only Local: only detect occlusion from the object itself, and not others. Inside: detect convex rather than concave shapes, by computing occlusion inside the mesh. Samples: number of samples to use, keep as low as possible best performance. If render time is a concern, using Pointiness from the Geometry node or baking Ambient Occlusion will render faster. Similar to the Bevel shader, this is an expensive shader and can slow down renders significantly. It can for example be used to add weathering effects to corners only. The Ambient Occlusion shader can now output a color or a float, for procedural texturing. 
The bevel modifier is a faster option when it works, but sometimes fails on complex or messy geometry. For that reason, we suggest to mainly use this for baking or still frame renders where render time is not as much of an issue. Note that this is a very expensive shader, and may slow down renders by 20% even if there is a lot of other complexity in the scene.
Use the Matte output of the Cryptomatte node to get the alpha mask. Use the Cryptomatte Add/Remove button to sample objects in the Pick Viewer node. Attach a Viewer node to the Pick output of the Cryptomatte node. In the compositing nodes, create a Cryptomatte node and link the Render Layer matching Image and Crypto passes to it. Enable Cryptomatte Object render pass in the Passes panel, and render. 
Motion blur, depth of field, transparency, and antialiasing are better supported.The objects to create a mask for do not need to be specified in advance, rather they can be chosen while compositing.It is effectively a more powerful version of the Object and Material ID passes with two advantages:
Cycles outputs the required render passes, which can then be used in the Blender compositor or another compositor with Cryptomatte support to create masks for specified objects. Cryptomatte is a standard to efficiently create mattes for compositing.
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