2 versions of the NSX is conceiveable and makes sense finacially and technically. I believe the Hybrid rumor is a smoke screen and the expensive version will likely have a V8.
Honda has been dodging the issue about the V8. I don't recall any Honda official saying outright that V8 is officially out. I remember an interview with x-CEO Mr. Yoshino and his response was that it was something they rather not discuss. Historically, when Honda rather not talk about something, its because they are cooking up something.
Several years ago, Honda dismissed they were developing a Pick up truck, and look what they showed us at the Detroit show.