Ok, I'm going to "piggy back" off the top about who to cast as Michael Knight and take it one step further. First, here's my choices for Michael Knight...
Tom Welling - http://en.wikipedia.org/wiki/Tom_Welling
. enough said.
Sean Faris - http://en.wikipedia.org/wiki/Sean_Faris
Not sure who I would cast as Devin. That would be a tough call. As for KITTs voice...we all know Will Arnett would probably do it if the car is a GM product. So for the moment I say him. But I think there are other options. Who would play Bonnie? Who could play Stevie? Let's go even deeper, who would we want to Direct? What studio should release it? Duh...Universal. It's theirs. I mean they did at least try, to do Miami Vice. Why they didn't to the A-team, no idea. Moving on, we all know Mr. Larson has a script, but their's also someon who usually polishes it. What about Tom Greene. haha. I'm sure he would jump a the chance. What about a big, big name...Paul Haggis. Look what he did for the Bond franchise. Producers...anyone but G.S.T. Sorry bud, but you went in the wrong direction. Your show just didn't have the heart the original did. I could see Brian Grazer for some reason. He knows some action...why you say...well he produced 24. Doug Liman could produce again...just because he is used to handling the bigger movies. But you want to make sure that Mr. Larson has the biggest say in the movie.
All interesting questions, but we need a completed script and a director before we can go any further.