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So i searched a bit through the apple dev forum and found this. A user was able to activate siri by changing the location of the App/iTunes store (in settings). So my guess is you can use an Apple ID from a country where Siri is available und use it!

Which would be awesome for me as Siri is supported in Germany (and german is my native language) so i can just use my german iTunes account and use Siri. It will probably take apple ages to release the Apple TV itself and Siri support in austria.
 
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