Well the concrete changes for the next version are:

* Cleaned up icon
* Support for playlist folders

Possible things that may be in the next release, or the one after:

* Support for searching for playlists
* Fix audio cut off at end of files

Further in the future:

* Large player that can be popped up by tapping the small player and provides additional controls.
* Last.fm scrobbling
* Playlist creation/editing
* Bluetooth media key support
* Rockwatch integration (so playback can be controlled from a Pebble smart watch, plus the facility for any other app to control playback)