Family Tree is an upgrade from new.FamilySearch that combines the best features and data from new.FamilySearch and adds powerful tools for data accuracy, usability and collaboration. Many tools in nFS have now been disabled as the transition is made (separate, combine, possible duplicates, etc.). Now is the time to make the switch, if you haven't already. Although change is sometimes difficult, I think you'll be pleased once you give it a try! If you have questions you'll find excellent online training at this link.
Source: Logan Utah Family History Center Newsletter, Nov 7, 2012, Vol 13, Issue 44