Nvidia agrees that D8M and D8E are simply evolutionary steps as it shrinked its chips from 90 to 65 nanometre but the real next generation will come next year probably in Q2 if not later.
This matches the Nvidia's financial conference call where one of the Vice presidents said that Nvidia will have at least two new high end product until the next analyst call. This one usually takes place once a year.
D8E is a dual PCB dual chip card while D9E is a new chip that we don't know much about. We know it will be much faster than G80 but that is about it. In 2008 the graphics boys can do 55 nanometre and it will be too soon for 45 at least we think so.