Despite really needing marquee exclusives last fall, both Crackdown 3 and State of Decay 2 failed to meet their initially planned release windows and were both pushed into 2018. Now, we're simply waiting on official word from Microsoft on when we might expect these two big, exclusive titles.
But Microsoft has yet to announce any dates, but it would seem that Amazon has been unable to keep tight-lipped about the release dates. At the time of writing, Amazon Spain has listed State of Decay 2 for a May 25th release.
Crackdown 3 has also been listed by Amazon Spain for a release on June 29th. Both of these dates are Fridays, which increases the likelihood of them being genuine and not mere placeholders, both games are also expected during the second quarter. However, keep in mind that these release dates are not official for now and there could very well be an error on Amazon's part (or further delays, of course).