Recently Facebook announced that it would be releasing Timeline for brands, which you can update right now, or you can wait until March 30th when Facebook will automatically make the change. The biggest thing that you will want to have prepared before updating is a banner to fit the Timeline header section which Think! can assist you with. Another thing you will want to think about is your tab applications, while the content will still fit the large area nicely you will want to update the thumbnails to fit the larger preview boxes along the top.
I would suggest reading the blog post Mashable recently did on all of the changes that we can expect when Facebook rolls over to the new Timeline for brands.
If you have any questions about the new Facebook Timeline feel free to email Phil@thinksocialmedia.com and I will try and answer your questions as best as I can.