G_Bison, but Enterprise predates both Nero and Star Trek, so the timeline should not be changed for things that occurred 25 years prior to Star Trek, as that was when Nero burst into the past.
Oh, I agree with what you said and yes, Enterprise predates Nero's incursion but, what I was saying you have to look overall at what has happened.
The Klingon's been having a round of bad luck dealing with Humans, especially with what happened with the Augments and the retro-virus that caused Klingons to look human. Also, only a colony was affected, not the entire race...
Nero shows up, was a "guest" of the Empire till he escaped and took a good chunk of their fleet.(Deleted scene from the movie where he was captured by the Klingons.)
Now spoilers. The reason why Khan looked the way he did was Section 31 can't have a 300 hundred year old Indian running around and doing "things" especially since the Federation knew nothing about. He was altered to blend in, remember last time anyone saw him was back in the 1990's and the computers would flag his image.
The other thing that will probably play out in the next one is that the Klingon's are/will be pissed because of the fight/slaughter of Klingon troops on their homeworld. Because Nero destroyed a good portion of their fleet, it look liked Praxis, the Klingon moon. Was overmined because of the deficit of ships caused by Nero, Praxis was destroyed in Star Trek VI. But judging by the new film, Praxis is already destroyed. Either that or JJ got severe continuity error going on and left the moon destroyed rather than normal...