"Quite different from these community-driven efforts is the new and unpronounceable Tizen:
Tizen logo Tizen is an open source, standards-based software platform supported by leading mobile operators, device manufacturers, and silicon suppliers for multiple device categories, including smartphones, tablets, netbooks, in-vehicle infotainment devices, smart TVs, and more. Tizen will offer an innovative operating system, applications, and a user experience that consumers can take from device to device.
The Tizen project will reside within the Linux Foundation and will be governed by a Technical Steering Group. The Technical Steering Group is the primary decision-making body for the open source project, with a focus on platform development and delivery, along with the formation of working groups to support device verticals.
Tizen will provide a robust and flexible environment for application developers, based on HTML5 and Wholesale Applications Community (WAC). With HTML5's robust capabilities and cross platform flexibility, it is rapidly becoming the preferred development environment for mobile apps and services. The Tizen SDK and API will allow developers to use HTML5 and related web technologies to write applications that run across multiple device segments, including smartphone, tablet, smart TV, in-vehicle infotainment, and netbook.
The LiMo Foundation has a little more information about Tizen's origins:
Tizen combines the best open source technologies from LiMo and the Linux Foundation and adds a robust and flexible standards-based HTML5 and WAC web development environment within which device-independent applications can be produced efficiently for unconstrained cross-platform deployment." (http://www.h-online.com/open/features/Is-Android-s-bane-a-boon-for-Free-Software-1358433.html)