For those who want to know more about the shield internals, here are two views on the electronics:
Top side:
Notice the PCMCIA / mini PCI-E - slot: I am not sure if this is only on the first batch or on all boards but it could potentially be used for adding wireless connection to the board.
The bottom side:
No more: Shield Pro v1, Chaos Calmer, FW 1.51 SP1