yes, it was automatically upgraded after you applied all available updates, but if you want to use kernel 4.8 and the backported drivers from ubuntu 16.10, you have to opt-in to the hwe stack. By the way, this is what I'm running on my fedora workstation :
[cl@cl-fw-1 ~]$ cat /etc/fedora-release
Fedora release 25 (Twenty Five)
[cl@cl-fw-1 ~]$ uname -a
Linux cl-fw-1 4.9.10-200.fc25.x86_64 #1 SMP Wed Feb 15 23:28:59 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux