The lack of motion blur for corner-pinning in AE makes the whole Mocha / AE setup fairly useless, but since Mocha is such a great tracker, it was worth working out how to add motion blur in AE from the corner-pin data.

It's a small, very simple plugin which replaces textures by using a UV map (like maltaannon's youveelizer, but with much fewer features)

Use this plugin to generate a solid color rounded rect or sample footage to easily add rounded corners to your footage.

A practical application of a layer space transform.
Not very new, but still very useful.
by Dan Ebberts's resource for After Effects scripting and expressions