Facebook is reminding all Page administrators of tomorrow's Timeline update. Late last month, Facebook announced Timeline for Pages and started rolling out the update. While Timeline is mandatory, Page administrators have had about a month to curate their Page before the new design goes live for everyone on Friday.
Here is Facebook's message to Page administrators:
Reminder! Tomorrow starting at 11am PST we will begin to migrate Pages who have not upgraded yet to the new Timeline format. If you admin one of those Pages, you still have time to get your Page ready by adding a cover photo, milestones, etc. before tomorrow! Check out these tips from other Page admins: https://www.facebook.com/marketing/posts/10150758346981337