Nope, I do remember that option being there initially when I decided to use it, I also selected the option to always use the new cPanel but I logged in today and it took me to the old cPanel and I can't get back :P
http://i.imgur.com/rctJpiE.png
I can't access the cPanel Basic anymore, I am stuck with the default cPanel X3
http://i.imgur.com/9PkZdyM.png
But my friend who is also on x10hosting can still access the custom cPanel :(