Although development of OpenLayers 2.x continues, work has started on a new OpenLayers 3. A repository has been created at GitHub, and a set of fundamental goals has been created. These goals include:

• Trigger custom application events from the map.
• Streamline the drag flow.
• Map properties rule. Layers derive projection and related properties from the map.
• Layers advertise their ability to render in a projection.
• Location is the future, and it is smart. Geometry comes from Location, and is also smart. LonLat is gone.
• Layer visibility can be mutually exclusive within a group.
• Improve performance of hot code (stuff that is executed a lot).
• Create a simple core set of utilities and provide adapters for people that are using other JavaScript libraries that duplicate this functionality (reducing the amount of redundant code that has to be loaded).
• Look for ways to refactor the code so things can be excluded in applications where it is not needed (e.g. advanced geometry operations).
• Provide a simple set of widgets (like the layer switcher) but make it easy for people to use other widget libraries of their choosing.
• Facilitate mobile browser support.
  

The announcement for OpenLayers 3 can be found here.

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