I am excited about the changes and improvements that are being made to Family Tree. It is part of FamilySearch.org and it will eventually replace New.FamilySearch.org. It will be available for members of the Church of Jesus Christ of Latter-day Saints and also for nonmembers. Members should sign in with their LDS account and then they will have access to LDS Temple information.
Watch this short Introduction to FamilySearch Family Tree video to learn more.
Go to Family Tree Training to learn how to start using the program. The training resources are very comprehensive.
I would advise users of New.FamilySearch.org to make the switch now. Stop using New Family Search. Starting watching the tutorials for Family Tree. And start updating and sourcing the information on your family in Family Tree.