Mobile Game Fire Emblem Heroes has receive some more levels to play with some new features (nothing major). The new levels have been added to Main Story Arc (as opposed to the Paralogues) and can be found in the latest entry as World Of Radiance. There are five new levels to play, each with three different difficulties. Ike and company are the latest Summoning focus and bring with them their unique set of Skills. You can see it all below.
Source: Fire Emblem Heroes (In-Game Notification)