I think as we get closer to release date and lot of apps will start to pop up in their app store. Currently from the links I've read from Amazons developer site they are testing all apps submitted for inclusion to the app store to make sure they are optimized to the Fire. They have been testing the apps currently in the app store to make sure they are optimized and run smoothly on the Fire.
They have also ask developers to submit their apps ASAP if they want them included by launch date, as some apps may require a week to test.
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