Yes, it uses 9-11 and13 because it has SPI bus.
SPI pins D11 and D13, that can be shared with Ethernet
Pin 12 (MISO) is not used - LCD has one way traffic.
Control pins are on D9 and D10 (CS and A0 signals)
Buttons connected to D2-D5.
Other pins are available.
See schematics http://bit.ly/a5wIyK
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Edit: Shields compatable with Ethernet/SD card are available - see my post in display forum