The first Release Candidate build of GanttProject 2.7 was published on Dec 12. We will be busy next days with building native OS packages, bugfixing and translations update and hopefully the release will be ready this year.
You can help us with testing! In addition to ZIP archive, GP 2.7 RCI is available as Windows installer, so testing is now easier for those who don't want to bother with command line. Windows installer places GP 2.7 into a separate folder on disk and creates a separate shortcut in GanttProject group of Programs menu, so it is possible to run it together with GanttProject 2.6.