Please read this
Windows Blog released by Microsoft on March 30th ...........
That's as close to a "confirmation" as you can get.
And every website says April 25th.
I guess you can take it to the bank ?
excerpt :
The Creators Update will begin to roll out on April 11th. Like with the Anniversary Update we delivered last August, this update for Windows will proceed in phases. Based on our experience and feedback from our customers, we believe a phased approach provides the highest quality update experience to the broadest set of customers. The first phase will target newer devices, especially those we tested together with our OEM hardware partners. We will then expand the Creators Update release to additional devices based on the feedback we receive during the initial phase. We’ll iterate this process over a period of several months until all compatible devices running Windows 10 worldwide are offered the Creators Update.
Windows Phone will follow the same phased approach, with rollout scheduled to begin April 25. Note that update availability may vary by manufacturer, model, country or region, mobile operator or service provider, specific installed software, hardware limitations and other factors such as feedback from customers.