The 950 can be hooked up to the 750 fine -- it's what I plan to do when I get mine. The 950 has 8 pre-amp outputs -- left, right, center, surround left, surround right, surround back left, surround back right, and LFE (subwoofer).
Here's a large picture of the back to refer to (someone came across this during CES and posted it here at the forum, and it looks to be essentially the same as the final hardware based on the pictures Outlaw put on their site earlier this week) -- note that there is a second set of connections above the outputs that are
inputs for something like DVD-Audio, which may have been hard to tell in a smaller picture. You will simply not connect the surround back speakers to anything. Grab some 0.5m PCA cables from Outlaw (the "short stack" gives you six of them for $80 plus shipping) or some 1.8m PCA's if you need the length, and just connect the five outputs that you are using (left, right, center, left surround, and right surround) to the 750's inputs.
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Gonk