GameStop had preorders on kh3 in 2010.
It wasn't a release date by se ever. Retailers hear about a products and they put a place holder date that can be moved. Ussaly December something of whatever year it is..it's not official it was just Amazon hearing stuff and hoping to get a head start. You can litterly look up the first official announcement on YouTube or something. It was like 2015 or 2016. The details of it bring split into more then one game came out right after..
So again...you got fooled..se didn't do it. Why you wait for official news.