Sure, the update gives the admin panel a cosmetic refresh, and stows some of the commonly used admin tools in easier-to-reach places. But the big news here is the ability to easily tailor what appears in the top navigation and the left rail on your page.
It's a change in thinking from Facebook and means you'll have to carefully consider what's most important for your customers to see when they first arrive on your Facebook page. After all, that first visit is your best opportunity to gain a new customer.
If you're a traditional brick-and-mortar, maybe you want to add a map. Are you a virtual company? Maybe you prefer getting your contact info front and center. Or jazz up your page with some photos, or related biz pages you "like."
Deadline: Two weeks.
Whatever the case, you've got two weeks to play with your overall design behind the scenes before all new page layouts are automatically pushed live. So, it's time to get your act together and be an early adopter. Early adoption lets your customers know you've got your $#*! together, and they'll be more apt to "like" a page that appears updated and active, than one that's stagnant and dated.