Today was a special direct for the Fire Emblem series and one of the things detailed was more information surrounding FE Warriors. This will likely mirror Hyrule Warriors regarding gameplay but the Switch footage (seen in the above trailer) looks quite good. But the most shocking news is that FE Warriors is NOT a Switch exclusive; it will also see release on the New Nintendo 3DS & New Nintendo 3DS XL.
No footage or information about that version was detailed but it will be exclusively released on Switch and New 3DS Platforms this Fall. We will likely see more gameplay, new characters and likely New 3DS footage around E3, so stay tuned for more information.