In the patent application Apple explains that "as notebook computers are becoming increasingly thinner ... connections systems need to be reduced in size to accommodate smaller form factors. The connection system includes a connection receptacle that is implemented as two separate components. One of the components is fixed in that it is coupled to the chassis, and the other component is rotatable or coupled to a moving mechanism," the company explained. "The combination of the fixed and rotating components are adapted to receive a plug when the connection receptacle is in an open position, and the fixed and rotating components are collapsed into a compact configuration when the connection receptacle is in a closed position."
"Accordingly, this collapsing function enables a substantial reduction in the size of the connection system and thereby enables a substantial reduction in the form factor of a device implementing the connection system," Apple added. "For example, a notebook computer may have a highly tapered chassis shape."
It is rumored that apple will release an Ultra-portable notebook sometime this year.