We were not planning to release a Pisound App update, but rather a new background service that will take care of automatic MIDI connections. We’ll make an announcement once it gets released, but you may give it a try by following the manual build steps in this post Script for launching PD patch with MIDI without aconnect and two replies below.
The current Pisound App does connects all MIDI hardware that was connected to RPi at the time the Pure Data patch got started.