The UI framework in Pharo receives an update. Spec2 will replace Spec over time - it is already included within upcoming Pharo 8 (which is still in development). Both run in parallel to ease migration.
Source code is also on GitHub:
It is possible to load Spec2 into latest Pharo release - Pharo 7. You will find a script on the project page. Some early documentation on Spec2 is already available as PDF booklet - but as the framework itself work in progress.
Spec2 will also allow for a binding to other backends like Gtk (which is based on Mars project from Esteban):