Smalltalk Squeak is the most known open source implementation of the Smalltalk language.
Gtk are a powerful, lightweight and multiplatform GUI Toolkit.
This project aims to create a Gtk wrapper for Smalltalk Squeak.
Actually, wxSqueak is the unique and therefore the most important GUI Toolkit port for Squeak.
wxSqueak is a great and complete project, but wxWidgets itself is different from Gtk.
On the other hand, Squeak has its own graphics called Morphic, which GUI applications are unfortunately not really enduser-friendly.
Yes, you can find them in the ScreenShots page.
Really not, or not now at least. Our purpose right now is to complete all the Gtk+ API and offer an efficient and stable wrapper. In the future, we could think of a similar idea.