M-Audio has now released the follow-up to it’s hand held recorded MicroTrack. MicroTrack II features 2-channel WAV (BWF) and MP3 recording and playback. It is battery operated and stores on either CompactFlash or microdrives. For connection, MicroTrack II has balanced ¼” TRS inputs with line inputs and 48V phantom-powered mic preamps. It supposedly has extended input gain range compared to the original MicroTrack.
Much more info at M-Audios website.