In reality, noone outside of Matrox knows jack about it.
There are loads and loads of rumors flying around, including rumors of unheard of mem bandwidth, Matrox haven't even confirmed that the card even exists though.
So if you're looking for hard fact, you're gonna have to play the waiting game along with the rest of us.
Me, Im hoping for Matrox to save me, by delivering top notch 3D performance along with their legendary 2D quality, but time will tell.