rear suspension mods for 2010 Prius?

So I was at the dealer waiting for my Prius' oil change (they gave me 5w20 but only charged me $27). I noticed the 2010 Matrix brochure has a ghost view of the AWD rear suspension. I'm not saying this is within my skillset (since I'm having someone else change my oil and all), but does anyone know how much of the rear brake assembly from the AWD matrix would fit in a Prius?

I only got to thinking about it because the rear diff in the Matrix reminds me of the rear drive module from the RX400. Between that and an upcoming PEV-kit from A123, should I hold my breath until someone offers an AWD kit for the Gen III Prius? Is it ray2: or would I more likely see :flypig:?