So rare I get to answer my own questions here. As I was posting, guess what arrived in my email inbox... the March newsletter! In their own words,

"...some may ask why we are introducing a five channel amplifier at a time when many home theater enthusiasts are moving to six and seven channel systems. The answer comes to us daily in the continued sales of the Model 750, and from the inquiries we receive from consumers. With both the 755 and the 770 available, we leave the choice of a five or seven channel configuration up to you. The Model 755, as the Model 750 before it, will also find a home in systems where the Model 1050 is used as a preamp, but where higher amplifier power is required. In addition, a surprising number of customers tell us they have been using the Model 750 for a variety of non-traditional applications such as bi-amping, multi-room systems and other creative situations. With more power, the Model 755 is a worthy successor to the Model 750."

They also post the specs (200 watts per channel at 8 ohms, 300 at 4) and promise to have pics and such up within twenty four hours.