I have been working with the Developers for the last few weeks on this. These are the guys that make USB Audio Recorder Pro which does allow playback of HD files, but since it wasnt designed for playback they made another app when the Devs from PowerAmp didnt reply to them on partnering. It doesnt necessarily have all the bells and whistles of some other maybe more mature players, but they cant play HD music through a DAC properly. And yes, it may be a little expensive for the app, but then again so is HD music.
I have this working on my xt926 with an AudioQuest DragonFly DAC.