'The Amazing Pentax 645D'...

[Panther_99FS]

http://www.petapixel.com/2010/03/10/pentax-joins-medium-format-dslr-game/
http://www.petapixel.com/2010/05/20/pentax-645d-40-megapixel-sample-photos/

[Kiwikat]

These 40 megapixel photos are 7264×5440, and weigh in at around 17 megabytes each.

That resolution is insane. How does it get such a small filesize though? They must be talking about jpeg format. RAW files of that resolution should be over 50 mb.