64GB flash drive barely exist. 120GB is a fantasy and if by chance one did exist, it would make this thing more expensive than the 17". This is a fake.
Whilst I agree with most who have already posted that the circumstance, presentation style, not to mention the likely retail price of this "new" Apple device would be more likely factors in rendering this a fake. I'm not so sure we can discount the 128 (or even 1 * 20 GB) since both capacities appear to be available from San disk - albeit in a larger SCSI format than the 2.5 inch drives that most are referring to as cost and capacity multiple examples.
I won't take credit for the link since it was already posted in this forum, but I've not seen anyone comment on the fact that San Disk actually DO appear to have a 120 GB capacity SSD (flash) unit available.
Also found this which is intersting regards the rapid price drops in SSD type drives. http://www.extremetech.com/article2/0,1697,2103810,00.asp