Directly to you from Twitter:
Thanks to your votes, Ike and Lyn will gain special Choose Your Legends versions. To show our thanks, Roy and Lucina will as well! #FEHeroes—
Nintendo of America (@NintendoAmerica) February 09, 2017
…Wanna play? Buy a 3DS.
That being said, click on Fire Emblem Heroes for everything you need to know about the game. 😀