Not sure if I am that excited with this overhaul. I guess Touch ID is a nice addition.
TouchID isn't just a reimplementation, it's a massive technological improvement that elevates consumer fingerprint readers from gimmicky afterthoughts to a core part of UX.
"PC laptops had it and it never took off" is a horrible metric to judge anything. If the technology and implementation is trash, then of course it's not going to take off. That's why being first to do anything is a meaningless milestone. Be first to do it well, and you might as well have invented it.