Didn't know much about it, only that it was originally a novel released back in 2004. There are a total of 6 stories being told concurrently in real time with each story happening in a different era; future included. It was an experience as some scenes would last 20 minutes, then shift to another story but only letting it run for 2 minutes before switching stories again. I thought it worked and I was satisfied.
I will advise that if you are going to watch Cloud Atlas, because it's long, you have to just let the movie wash over you before you start connecting the dots.