Hi @BKHOURY13, welcome to our forum and I'm glad to hear that you are interested in purchasing an Xperia XZ Premium! 
This is a global forum and release dates may differ between markets. The information I have available is that It will be available in late spring of 2017 and for a more specific date regarding your region/market, I'd recommend that you get in touch with your Local support team.
They are the experts on your market/region and are better equipped to provide you a bit more detailed information on a release date in the US!
I hope that helps!
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