A news is coming that The Tizen 2.0 source code and SDK has been released  and here are some details and some information about Tizen.
What is Tizen? ( Wikipedia)Tizen is an operating system for devices including smartphones, tablets, in-vehicle infotainment (IVI) devices, and smart TVs. It’s an open sourcesystem that aims to offers a consistent user experience across devices. Its main components are the Linux kernel and the WebKit runtime. The Tizen project resides within the Linux Foundation and is governed by a Technical Steering Group (TSG) composed of Intel and Samsung.

Many changes has been done to this Platform to make this more attractive to developers even Tizen 2.0 adds new APIs that developers can use to access Bluetooth and NFC function on phones with that hardware.
This can be downloaded from here and here is the list of operating system in which it can be downloaded:-
  • 32- or 64-bit Ubuntu
  • Windows 7
  • Mac OS X on Intel
Some Notes of its features available here