Most of that new Destiny's Child song that's being credited to 'Kelly Rowland featuring Beyoncé and Michelle Williams' (IT'S DESTINY'S CHILD, YOU CAN'T FOOL US ROWLAND) has appeared on the internet.
'You've Changed' appears on the new Rowland album 'Talk A Good Game' and is a low-slung affair about a good for nothing man etc etc and so on.
You can listen to 2:52 of it here.