"Today we are excited to announce Tizen 1.0 Larkspur, including the addition of new complimentary components, as well as source code that focuses on enhancing stability and performance. We believe that these updates and new offerings improve the experience for developers. We are also continuing to work on improvements and additions, and we will be doing frequent updates to the SDK and source code. There are a few additional components that we plan to add in the coming weeks, and we will continue to fix bugs and add additional features," from the Tizen.org announcement.
Tizen 1.0 includes a simulator as a browser-based tool that supports the Tizen APIs for easily debugging web applications and running applications under different device profiles, IDE improvements, and the emulator has been improved with Intel Hardware Acceleration Manager for Windows and OpenGL acceleration for Linux.
On the Tizen Web side of Larkspur, there's new features of the W3C/HTML5 specification, the Tizen Location code supports POI (Points of Interest) and route search, and there's WiFi Direct key features for Tizen Connectivity. Additional features of the 1.0 source are mentioned here.