The release of Sugar 0.98 also incorportates many improvements to the GTK3 port. The Sugar Developer Team deserves a resounding celebatory cheer of thanks for their effort.
OLPC has been incorporating Sugar 0.98 in the 13.1 series of builds, available for download to run on the XO.
What is new for users? Alphabetical ordering in the Home View
The icons in the Home View are now ordered alphabetically. This change has been applied to the favourites view and the activities list view.
What’s new for developers? Activity Authors guidelines
The most important change is that the GTK+ 2 based sugar-toolkit has been deprecated since Sugar 0.96. Newly written activities should use sugar-toolkit-gtk3, which is based on GTK+ 3 and Pygobject3, now. There will be only bug fixes being available in the future for the old toolkit no new features will be made available for it and it will probably go away at one point completely. Detailed guidelines for porting existing activities can be found at Features/GTK3/Porting. Tutorials
There is a brand new step-by-step guide for developing Activities under Fedora 17.
For more details click here.