Unity3d 4.3 2d learning

Where can i learn the 2d development about unity 4.3 version, who can tell me some ways to learn this , thanks

Here is a “2D Game Development Overview” from the Unity fellows:

http://blogs.unity3d.com/2013/11/12/unity-4-3-2d-game-development-overview/

The sample project can be downloaded here:

https://www.assetstore.unity3d.com/#/content/11228

The documentation concerning the 2D components:

http://docs.unity3d.com/Documentation/Components/comp-2DGroup.html

A brand new carefully crafted tutorial (in text and animations, not a video):

http://pixelnest.io/2013/11/unity-2D-tutorial/

Yet another in video:

http://brackeys.com/preview/2d-unity-4-3-course/

And this video is about the demo and from the Unity team:

http://www.youtube.com/watch?v=4qE8cuHI93c

Here is a live test video:

http://www.youtube.com/watch?v=_qS7DD5Tz_A

Here you can follow news from the Unity fellows on the 2D theme:

http://unity3d.com/#2d

And finally here the original presentation from Unite 2013 a few months ago:

Unite 2013 - New 2D Workflows