It is finished! io.js + NodeJS = NodeJS 4.0.0

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The joint release of the io.js and nodejs commands was released as 4.0.0. Release functionality is close to the release of io.js 3.3.0

Key changes:

• V8 updated to current version 4.5 (was 3.26)
• Added support:
  
  • classes, generators, string patterns, new string processing methods, typed arrays (including the Buffer object implemented on the basis of Uint8Array V8)
  • Map and Set data structures for working with collections
  • Promise mechanism
  • Symbols type
  • arrow functions
• ARM architecture support (ARMv6, ARMv7 and ARMv8)
• cluster for testing Node.js on various hardware platforms and OS

Read more about branch numbering, development cycles, backward compatibility here.
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Almost half of the features of the ECMAScript 2015 standard has been implemented. With this and congratulations to all!

Download nodejs 4.0.0

UPD:
Already wrote:
New version of Node.js v4.0.0 released
Node.js + Io.js = Node.js 4.0.0