Serebii.net has confirmed that the release date for these games will be in the Autumn for both Europe and the US. There is a chance it's too soon to say for sure, but this is what the creators had said. There's no specific month or day, just autumn. But I'm thinking it's probably going to be near the end of October at least.
By the way, the actual types of Kyushiram and Kyuekrom (I just called them that for convenient purposes) aren't confirmed beyond Fire and Electricity. What do you think their second type will be? Ice or Dragon? Comment below with your thoughts :3