The button on the Cruise stalk now enables the cruise control to be selected (little light on the stalk comes on), pushing forward and back turns on and off actual control at what ever speed you had set once it is activated by pushing up or down , which also raises or lowers the set speed. The ACC twist knob does nothing.
Which means you have the same cruise control as the rest of us just with a different stalk. ACC will probably be activated in future software though...