I just came across
this Japanese blog.
The writer disassembled his device, presumably bought in Japan. Some pertinent points are:
- His device came with iMX508 (Freescale MCIMX508CVM8B)
- A reader commented that the device he received contained iMX507
- There's an internal micro SD socket.
It appears that for the JP launch, both 508 and 507 models were distributed. This would also tend to support the reports from elsewhere that both CPUs are in circulation in all markets.