Given how this game has been handled, along with the swiftness of the dlc, doubtful there will be any major QoL fixes or meaningful feature updates.
Hope I'm wrong. This game was held in a fairly complete status for so long, I wouldn't be surprised if a new release, such as the Sigurd Dating Sim(FE4 remake), or FE3H2(due to fe3h success) is around the corner. The dlc is getting rushed out so fast(likely from being complete for such a long time) yet typically a studio would spread it out a bit more. Hopeful this means a new release or announcement, especially a bit after the last wave.