No 17 inch MacBook Pro yet

It is now a month since Apple brought out its new range portables and since then some of us await a 17" model to be released.
Rumours initially stated that the release date of the machine was pushed back because a problem with the screen. It is possible, given that the slab of glass weighs down the screen, and that the hinges of the 15" machines already have trouble to support the weight and to ensure sufficient stabilisation at any given angle.
But the most probable cause could be related to the new manufacturing process of the bodies of these machines. Previously, it was sufficient just to create a mould and press them out. It is probable that the production chain has not been adapted yet to this different work or quite simply that the machine tools intended for this format are not ready.
This may give Apple a chance to bring out a model that takes account of various criticisms: why not with several Firewire ports and with an option to have a matte screen?