It's a reboot. Period.
No it isn't. Period. If it was a reboot the characters in the film wouldn't openly talk about how things turned out in the original timeline, nor would one of the participants of those events get called up on the video phone. Those things do not happen in reboots; by definition they cannot.
King Daniel Into Darkness wrote:
Plus, Khan Prime's skin colour changes between "Space Seed" and WoK anyway.
So Abramsverse Khan would've eventually lightened up on his own?