While I realize that this is the result of nothing but product placement cash, the use of a Mustang for KITT is a poor choice from a creative standpoint.
KITT is supposed to be a car "of the future." Indeed, while dated today, at the time of the original series the Pontiac they used was one of the more forward-looking cars being mass produced.
In contrast, the current Shelby Mustang was deliberately designed to have a certain "retro" feel. That undercuts the necessary aura of futurism you need for KITT.
Unfortunately, as noted before, this is about which car company ponied (pun intended) up the most cash. So I guess we're "stuck" with the Mustang.
I at least hope that something on the front end lights up in red....