I noticed that the new Enterprise looked a lot bigger when I saw the movie. When they did the shot of the shuttle bay, I thought it looked too big to be on the original sized Enterprise. Then I checked online to find some length figures and was shocked to see that they increased the size to somewhere between 762m and 914m. That's a huge increase in size. Not only did they double or triple the length, but you have to realize what that means in terms of overall volume (not only is it longer, it is taller and wider). If it is 762m, then by overall volume, it is approximately 18 times larger than the original Enterprise. If it is 914m, then by overall volume, it is approximately 31 times larger than the original Enterprise.
Here is a comparison chart I made up. It is to scale.
Nobody is certain of the exact size and there is some debate on the subject. However, it seems very likely that the size of this new ship is somewhere between 762m and 914m. Here is a thread over on startrekmovie.com on the subject.
http://www.startrekmovie.com/forums/showthread.php?t=7156
I'm not sure how I feel about it. It just seemed like an odd thing to do. I guess being fans of Star Wars, they were trying to increase the "wow" factor by increasing the scale of the ship.
Here is a comparison chart I made up. It is to scale.

Nobody is certain of the exact size and there is some debate on the subject. However, it seems very likely that the size of this new ship is somewhere between 762m and 914m. Here is a thread over on startrekmovie.com on the subject.
http://www.startrekmovie.com/forums/showthread.php?t=7156
I'm not sure how I feel about it. It just seemed like an odd thing to do. I guess being fans of Star Wars, they were trying to increase the "wow" factor by increasing the scale of the ship.