The 770 that psklenar got pictures of in May has the channels a little closer together than the 750 (which is sort of inevitable when you cram seven channels into one chassis), but otherwise looked identical.

What kind of cables do you use? Assuming the 770's binding posts are arranged similarly to the 750's, I will say that I've been able to bi-wire my mains with a combo of Transparent MusicWave Super and TMC Gold Label Reference speaker cables (the TMC's have 8mm spades rather than 6mm spades, because of my Paradigm speakers). Not very petite cables, particularly the bulky Transparents. I've also got a center channel bi-wired with TMC on the 750; the other two channels have speaker cable connected with banana plugs. Crowded, but the only real problem I had was holding stuff in place while I tightened down the binding posts with the entertainment center up against the wall...