I’m trying to consider every aspects into my learning process and i am currently into figuring out how to make the rigs inflated with muscles that would perfect the model’s deformation. I’m also working in a gaming perspective so i’m unsure if any gaming engine would be compatible with such rigs… Lighten up my way ô wise blender artists! 
What i found out yet (is it up to date?) http://www.3dvf.com/actualite-944-blenrig-4-rigging-et-skinning-automatique-sous-blender.html
And http://www.youtube.com/watch?v=axr-XZOE6UI which seems really rigify compatible…
Thank’s in advence!
Matt