Well... I kind of expect that none of the original cast will be in the movie or the TV show. I would expect them to all be re-cast. I been thinking about it as I been reading differing viewpoints and information that comes in. All I know is I plan to see the movie (on DVD hopefully since I'm not able to go to a movie theatre) and the TV movie and hopefully series (if I can see it on Broadcast or iTunes). And all I care is that I be entertained.
After reading plenty of KR fanfic, I've grown accustomed to different people, situations, universes and even KITT and KARR as not cars but human or android even. All in all, it was entertaining. So if the movie and/or TV show is good, I don't really care who is in it, I'll enjoy it anyway.
It would be great if William Daniels played KITT again and if they had KARR in the show or movie that Peter Cullen reprises his role. But if not, I was thinking of a really really cool idea: Computer and Cepstral voices!
Cepstral William sounds very close to KITT and you can further tweak the sound with the included SwiftTalker software. So one could get a real-live computer KITT talking!
Cheaper than hiring a voice actor and the computer never forgets it's lines. LOL! Plus it'd be authentic. Then if they go further with the franchise, they can make a replica of the new KITT car, slap in a Lilliput Blaxtreme or other Car PC system and programs, and the same Cepstral voice setup (plus if you get zabaware.com's Ultra Hal Assistant and do a bit of work on that), you can get KITT to actually converse with people at shows and stuff!
But we'll see how they handle KITT's voice. I too hope that William Daniels does it. He might be up there in years, but many people do a lot even into their 80s. My step mom is an active senior in her 80s as well.
80s is the new 60s.