Easy answer is: yes we are working on new things for the Sylphyo. But don't ask us for a timeline.
We are still gathering evolution requests and check what is possible in the Sylphyo embedded software platform. As already stated, some enhancements require a full software platform rewrite which requires months of work.
Next firmware version will be available when we feel it would be ready for release (and probably provided to volunteer beta tester prior to this release).
Meanwhile, I wish any Sylphyo player to enhance his skills on the instrument and play good music (it would interesting to share links to the music you are playing with the Sylphyo).