'Samsung galaxy S5 will not have a irisscanner'
It seems Samsung will not put in the irisscanner on the Samsung galaxy S5. There are a view reasons that it will not be on there, but mostly because it would make the device bigger and with a bigger screen it would not be a good stap therefore Samsung would probelly not put on the irisscanner.
It is suggested that Samsung will put in the Fingerprint scanner. This scanner would be below the screen. So no different button or anything like that.
It seems scanners like this will happen around 1 year later. But it might also be something for the Samsung galaxy note 4.
But for that we have to wait and see what will happen.