And it's no spoiler (since it's now available in a published "prequel comic") that, in Nero's "past" (post-TNG-era), Romulus isdestroyed. It's because of this that Nero sets off on his own mission... to save Romulus (in the past) while taking revenge on the Vulcans who COULD have saved Romulus but, in his eyes, simply chose not to).
[Darth Vader] Noooooooooooooooo!

I didn't 'know' this until reading the about #2, but it's what I expected.
I think that the "reset button" for this movie will end up being Kirk, Spock and Co (aboard the "Alt-Enterprise") taking an action in their timeline which will, in the future., prevent the destruction of Romulus
Agreed.