Nintendo answered fan requests for a 3DS entry in the Fire Emblem series at today's 3DS press conference. The tentatively titled "Fire Emblem" will be released for the system in Spring 2012.
The big new feature for the game is that it will allow for cooperative play. You can team up with a nearby player to fight together.
CORRECTION: The above statement was incorrect. The cooperative feature Nintendo was referring to is amongst your units on the battle field. Neighboring units can be made to attack a single enemy simultaneously. The game does also have two player wireless play, but details on this were not announced today.
Visit Nintendo's information page for two video clips.