This is a big release.

The buttons menu was completely redesigned in the UI and in the way the payload is passed through nodes. That means 1. Buttons in Button nodes must be added again (sorry there’s no migration for that) 2. If the Button node was configured passing parameters through msg.payload, it’s likely it will not work anymore, the format is changed. Basically every button has a type and different parameters based on the type, see Buttons node for more details

Based on this redesign, Generic Templates and List Templates and Quick Replies were added to Facebook Messenger. Account linking node was deprecated (replaced by Button node).