I tried to add supersized 2 to a page with a dynamic Server Connect datasource.

The datasource was not visible in the Supersized panel.

Could you give me an idea when all extensions are server connect ready?

Hey Dik,
Extensions like Supersized 2 will be updated in the upcoming weeks, so they will be fully compatible with the Server Connect queries
Meanwhile you can still use the "old" data sources in order to have a dynamic slideshow.