I feel that I can safely say that won't ever happen. They just confirmed they aren't even developing it for Windows Phones- I can't imagine they would develop for a Kindle before that.
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See here's the thing. developers for androids don't just make another version for kindles. they get uploaded onto Google play and later Amazon decides to bring it to the Amazon appstore for kindle users to use. I am sure in the future they will add it, but not for a while. because a kindle fire IS an Android device.
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Im sure you can find a file to download on your kindle
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Ahh but the windows phone is a totally different platform, the Fire does run a version of Android. It may not even need tweaks (though I'll admit I don't know not being a developer). It may be more a matter of getting it on the Kindle App Store rather than just Google Play.