We're hoping to upgrade to Confluence 5.5.2, but we're waiting for Widget Connector to be compatible as well. I couldn't figure out where I could ask this, so posting here. Please let me know if there's a more appropriate place to post this question.
I couldn't see any release date in the plugin roadmap page.
Since the plugin is stated in the new confluence 5.5 documentation, I believe the plugin is compatible with the new version, but wasn't updated yet in the market place.
I recommend to upgrade confluence on a staging instance and test the plugin there :)
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