So I dropped by the Atmel/Arduino area at Maker Faire and took a look at the boards. There wasn't much noise there, and all the boards had "developer version" or something like that on the silkscreen, and none of them were actually running (though there might have been running ones elsewhere) so who knows how final those versions were.
The Due had a SAM3X8? (probably X8C: look like a 100pin chip), and looked very much like a MEGA.
The Wireless shield had the wireless module (which is REALLY tiny) plus the UC3 chip (I didn't check which one), and a microSD socket. Presumably, they could write firmware that would cause the existing ethernet-based sketches to work without many changes, which would be pretty neat.
The 32u4 board was suitably empty-looking.