Currently, Facebook is transitioning all profiles over to the new Timeline profile design/ layout.
At this time, there is NOT a way that Facebook allows you to opt out of the newer Timeline profile upgrade. This is really unfortunate, since it would be fairly easy for Facebook to give users the ability (or option) to use the more traditional (older) profile layout rather than the (newer) Facebook Timeline profile. For many people it would be a welcome option to be able to disable Timeline, since I think a large majority of facebook users are going to really hate the Timeline profile design, as it's way too confusing due to the two column layout.
In my opinion, Facebook would have been way better off if they did the Timeline profile layout design using only a one column layout. Two columns is just a mess, as there's just too much going on to look at or concentrate on at once. It makes viewing your own profile, or other friends profiles more of a headache, than a benefit (It's an ADD person's nightmare). The actually "Timeline" is somewhat useful to quickly see posts from years ago, but it doesn't need to be designed to have all your wall posts, photos, links, etc. spread out in two columns...