The current version can't install Google Chromecast extension, which is popular for Smart TV.
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I notice that under Settings/More tools there is a Cast media to devicewhich doesn't give my Chromecast as a device..
In Chrome there is a Cast option which allows casting to a Chromecast.
I hope that Edge will include Chromecast as a device at some time.
I too noticed this problem, we're going to settings>more tools>cast media to device isn't working like it should be. @RichardUK
On the announcement they do say that casting is not working at present.
I hope that when they get it going that it will include Chromecast,
as other Chromium browsers do.
@RichardUKChromecast support will be coming soon in Edge.