It will need a new receiver. I think they're in the process of porting the code over now. Last I saw, Charles Hansen from Ayre was suggesting they might be ready to upgrade the QB-9s in December, at a cost of $250 or so. Although -- as he pointed out -- there really isn't a whole heap of 24/192 material out there unless you're creating it yourself.
From a relative value perspective, the new Weiss FW interface is $1,300 but has USB -> AES as well and does 24/192 put of the box.