Don’t hold your breath. Patrick Bach, DICE Executive Producer, stated in an interview with EDGE that “money has been thrown” at the studio to implement motion controls. Bach is opposed to any motion control calling it a gimmick. He states that adding motion controls does not make the game, Battlefield 4, better.
Bach is not opposed to innovation but seems like he would only implement it if it is done right and would benefit the experience. Not half-baked implementation for Bach.
Makes one wonder if this is the reason why there is no Wii U version planned. Do you think there will ever be a practical use of motion in first person shooters specifically?