A purported iPad 3 back casing has turned up at Repair Labs, matching up with many of the improvements Apple is rumored to be developing for the next generation of the company's successful tablet.
Among the details offered by the metal housing is a new, smaller shape for the internal logic board. This would mean that the current A5 processor-based logic board would be ditched, presumably for a new design based on an A6 processor.
The smaller size of the logic board opens up more room that Apple may use for an extended battery. We also see a retooled space for the rear camera, as well as a new fitting for the LCD panel.
This new casing is apparently no thicker than the current iPad model, in spite of rumors that the iPad 3 may measure slightly thicker than the iPad 2 in order to accommodate a higher-quality screen.