I was messing around in the lobby testing all the new gadgets and everything works for me except the Premium horse was not working for me, it says "You need Premium rank or higher to unlock this mount".
I'm a Titan and this doesn't work for me, I tested this on an alt that is MVP and it also didn't work:

EliVdd: http://gyazo.com/30bf367ab7606c8830d3d90268b85604

1C3CREAM: http://gyazo.com/ffe0b91c22413bd15bc29783b3439af9