In a chat with Total Film, the screenwriter Simon Kinberg explained that having Kitty (played by Ellen Page) do the time traveling simply wouldn't work. Here's the main reason for the change in the story - Wolverine (Hugh Jackman) is the only character who would look pretty much the same in 1973 as he does in the present. Plus - Wolverine is the most popular character in the X-Men franchise, so it makes sense for him to be at the center of the plot.
For more deets on this X-Men news, be sure to check out the video below from Clevver Movies. If you're a fan of the original comic, how do you feel about this new version of the story?
'X-Men: Days of Future Past' opens on May 23, 2014