The Dark Below and House of Wolves will upgrade for free. The base game and The Take King will not. The best option for players upgrading from legacy consoles is to purchase Destiny: The Collection Upgrade bundle. It includes everything including Rise of Iron at a discounted price for players that owned TTK on a legacy console. Additional info can be found [url=https://www.bungie.net/en/Help/Troubleshoot?oid=44810]here[/url].