Dart libraries: dart:io
DNS lookup
IPv6 support
Upgrade sockets to secure sockets
Access to the PID (both for current process and the spawned processes)
dart2js Compiler
Added support for new function subtyping rules.
Reduced the amount of patching we do on native prototype objects to a single property.
Improved indexing operations on native indexable types like typed data lists.
Landed support for rethrow and treating throw as an expression.
Reduced code size by sharing code in mixins between all classes that mix it in.
Improved our simple type inferrer to produce better types.
Dartium
Greatly improved WebGL performance by using dart:typed_data for typed arrays.
Following up with Blink impact
Various bugfixes
Pub
Ship pub as a snapshot in the SDK
Use backjumping constraint solver to resolve dependency graphs
Select appropriate versions of packages to work with the user’s SDK
Dart Web UI
Implementing MDV v2 DOM APIs in dart:html
Dart Dev Rel
More cookbook recipes
dartlang.org works again on phone/tablet
Dart Up and Running is updated to M4
Published Lang Spec M4
Dart Tutorials now getting the CI love on drone.io
Dart Tutorials now has a deployment script (thanks to Adam Singer!)
Lots of prep for Google I/O
api.dartlang.org now faster thanks to Page Speed Service
Continued work on Sublime plugin, including integration with analyzer
New Article: Creating Streams
api.dartlang.org now faster thanks to Page Speed Service