After writting my comment I tried to compile newer version. But without success. As you wrote, Glade 3.16 requires GTK 3.10 and Glade 3.15 requires GTK 3.9.11.
Ubuntu/Kubuntu is sleeping on old GTK 3.8.4.
Therefore the newest version is 3.14.2 released 26 November 2012.
After writting my comment I tried to compile newer version. But without success. As you wrote, Glade 3.16 requires GTK 3.10 and Glade 3.15 requires GTK 3.9.11.
Ubuntu/Kubuntu is sleeping on old GTK 3.8.4.
Therefore the newest version is 3.14.2 released 26 November 2012.