Last September, an early release of Tizen 2.0 popped its head up, but disappeared back into its hibernation until now. The SDK and source code to Tizen 2.0 is now out, dropping its Alpha name.
Tizen 2.0 has now had some enhanced support injected into it, with HTML5 getting some amplification, as well as better Web UI framework that provides full-screen and multi-window features. Developers can now use the new hardware APIs for Bluetooth and NFC support, as well as access a device's call history, calendar and messaging "subsystems".
The updated OS now includes support for background applications, text-to-speech and IP Push, as well as reference applications including calendar, gallery and a phone app. Native IDE and an improved web development environment have been included with the latest code. More information is available here.