more information in 2.12.md

notes/2.12.md

@@ -1,4 +1,9 @@
-# Major enhancements
+# Major enhancements and additions
+
+## Zoom Control
+
+A simple control to add zoom in/out buttons on the map that can be entirely styled using CSS.
+See it live in this [example](http://openlayers.org/dev/examples/zoom.html).
 
 ## Tile animation
 
@@ -20,6 +25,56 @@ People can override this rule to use other transition settings. To remove tile a
         transition: none;
     }
 
+## Builds
+
+This version of OpenLayers ships with three builds:
+
+ * `OpenLayers.js`
+ * `OpenLayers.light.js`
+ * `OpenLayers.mobile.js`
+
+See the README.md file and the docs on docs.openlayers.org for more information.
+
+## Sensible projection defaults
+
+The geographic and web mercator projections define default values for the maxExtent, and units. This simplifies the map and layer configuration.
+
+For example, a map that used to be created with this:
+
+    map = new OpenLayers.Map({
+        div: "map",
+        projection: "EPSG:900913",
+        units: "m",
+        maxExtent: new OpenLayers.Bounds(
+            -20037508.34, -20037508.34, 20037508.34, 20037508.34
+        )
+    });
+
+can now be created with this:
+
+    map = new OpenLayers.Map({
+        div: "map",
+        projection: "EPSG:900913"
+    });
+
+## Tile Queue
+
+The tiling code has been overhauled so grid layers now work with tile queues.
+The tile queue gives more control on the tile requests sent to the tiling
+services. Tile requests that become useless can be aborted.
+
+## Tile Canvas
+
+Image tiles expose an `getCanvasContext` function that can be used for various
+things, like changing the image pixels, save the image using the File API, etc.
+See the [osm-grayscale
+example](http://openlayers.org/dev/examples/osm-grayscale.html).
+
+## Backbuffer Overhaul
+
+The backbuffer code (behind `transitionEffect:resize`) has been redesigned and
+rewritten. This overhaul yields better performance and code simplifications.
+
 # Behavior Changes from Past Releases
 
 ## GPX API change