The guys from Kilpatrick Audio showed an early prototype of their mobile music production system Tungsten at Superbooth17. It is an open source, Linux based device that can run a multitude of applications. One of the first programs, which are currently in development, is a tracker-style sequencer.
The Tungsten comes equipped with an OLED display and 25 buttons, line and mic inputs plus a headphone output. For communicating with external gear like synthesizers, controllers or an audio interface, there are MIDI and USB connectors.