According to Smarthouse, Japanese sources close to the production of Apple’s long-awaited television set have revealed that the device will be available in three sizes upon release—including 32” and 55” sets—and will sport a new OS incorporating Siri.

The OS is slated to run on a new processor that will also reportedly power the iPad 3, Apple’s next immediate product launch if rumors hold true. Japanese manufacturer Sharp is also involved in the project.

Of course there is the distinct possibility that the commonly dubbed “iTV” will never see the light of day despite Steve Jobs’ rumored plans. But if it does, a Q4 2012 or Q1 2013 drop is most realistic.

[via Smarthouse via Mashable]