http://www.bizbuzzmedia.com/blogs/airline/archive/2006/10/11/4932.aspx
.... by allowing passengers to recline without compromising the space of the passenger sitting behind, is designed to give passengers a sense of fixed personal space in economy class that cannot be interrupted by another passenger. This is achieved through a design which has the back of the seat receding into a shell and the seat bottom sliding forward when the passenger presses the recline button.
To further increase leg room, the literature pocket has been relocated to below the seat cushion. A larger than normal tray and personal television screen are also part of the new design. Cathay’s new economy class seat also includes some of the best features that are now part of existing economy class sections on some Cathay and other carrier aircraft, including a coat hook, an adjustable headrest, an upholstered seatback providing active spine support in all positions and on-demand in-flight entertainment. ...