Skill Powers actually weren't in the Compendium for a long time, although they've since been added in a way that I wasn't expecting, so I didn't notice them. The new classes and races from Dark Sun should show up as soon as they're added to the Compendium (which I don't think has happened yet).
The only exceptions might be things like the secondary classes they added; sometimes they don't add a section for new mechanics like that (for example, there's still no Background section on the D&D compendium).
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