This video explains how to create the simple rig needed for a HF Faceshifting Head
How to create a very simple head with just one blendshape( you can add as many as you like)
How to parent the head to the rig and do a basic automatic weighing.
How to apply scale and location.
How to use the correct fbx export ASCII2 settings
How to load the fbx into Faceshift
How to scale the model in Faceshift and to connect the bones and connect the blendshapes.
Export the fst file from Faceshift.
Import the fst file into HighFidelity
To do this you need ideally Blender 2.71 This new version of blender has a updated FBX Exporter.Earlier versions do not work.
Blender’s FBX Importer will not currently Import rigged meshes. However their is a 3rd party plugin that will.
https://sites.google.com/a/render.jp/blenderfbx/install. I would however recommend learning to build your own rig
a 30 day demo of Faceshift is available here http://www.faceshift.com/
Things to note- Finish your head before you make the Shape Keys i.e apply any modifiers. Once you have added shape keys changing the mesh will break things.