Mapbox GL JS v3 enables the Mapbox Standard Style, a new realistic 3D lighting system, building shadows and many other visual enhancements, and an ergonomic API for using a new kind of rich, evolving, configurable map styles and seamless integration with custom data. You can get more information about the new features in the Mapbox GL JS v3 migration guide. Changes since v3.0.0-rc.1:

Features and improvements ✨

• Improve performance for styles that use both hillshade layers and terrain.

Bug fixes 🐞

• Fix an issue with setConfigProperty not taking effect for certain properties.
• Fix rendering issues when a style and its imports share the same source IDs.
• Fix symbol-z-elevate elevating symbols over invisible fill extrusions (with zero opacity).
• Fix an issue with style validation accepting a style import with an empty ID.
• Fix an issue with validation of unknown properties in lights objects.