Depends. If Amazon is using any HTML based code for streaming, then it's hard since Apple TV doesn't do Web based UI.
It honestly itsn't that hard. Did it myself a couple of months back and took a week.
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It'll be nice, but it's not "late" yet. They've never announced a date. People just assumed...
We just have to be patient. Everyone's going to whine about how it's not exactly what they want anyways...
Um, They announced "summer 2017" Summer is basically over.