Why is Kirk wearing a black shirt?
Most likely a an undershirt. Though he is a cadet. After the Death of his parents, Kirk is raised by his uncle and doesn't enter the academy until nearly a decade after he is supposed to.
Why does the Enterprise look different, does it go through another overhaul before the series?
First, its 2008 and it needed an update. The Big E as shown in TOS was limited by 1960s technical knowledge and special effects technology. The JJ-Prise seems a more likely successor to the NX-class and lines up a bit better with the TMO refit.
Besides, its built 20 years later than in the normal timeline. Nero's attack might have resulted into a complete rethinking of the Constitution class.
Besides, its built 20 years later than in the normal timeline. Nero's attack might have resulted into a complete rethinking of the Constitution class.