This is one of the characters from Animsquad school I've been rigging lately.
It's been quite a change on the method I have used for the facial rig, since it's based almost entirely on joints and on-face controllers, instead of the usual blendshape-based with sliders GUI style (still, there are quite a bunch of corrective blendshapes used here!). It also has a new PickerGUI created for using the face controllers while hiding them in the viewport in order to keep the character's face clean.
Please check out this video with a quick demonstration on how the face rig works, followed by some cool animations done by Animsquad students.

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