His hair is getting ridiculous, though it is increasingly clear why he was cast as a young William Shatner... Speaking of which, will the old timer finally get a cameo after being shunned by the first two films in the new timeline? According to Birth Movies Death, it definitely will happen:
"This won't be original timeline Spock - it'll be future alt-timeline Kirk and Spock. Basically the scene will have Kirk and Spock interacting with their future selves."