Who's Watching The Watchmen?

The countdown is almost over. Watchmen opens tomorrow night.
As a fan boy, I am worried. I have heard that they changed the ending.
I can't imagine what part of the ending anyone could change without missing the point of the story. It's really what makes the graphic novel.
So, yes, I'm worried. I'll reserve judgement till I actually see the film. But this youtube clip will
confirm that people all over the world and beyond the boundaries of time
are also worried: