It would be great, to publish some kind of Roadmap.
I do not work constantly on DokuWiki (I have a life, too) so it's hard for me to estimate when the next release will be ready. I usually do a new release when I completed adding new features and fixed all major bugs from the last release. If you are eager to try a newer version before it is released, fetch it from the Darcs repository or download one of the daily snapshots.
A very rough list of what is planned for the next release is usually available at the todo page.