There is 12gb version but only at some part of the world.
North America
250GB - $269 (Uncharted 3/Dust 514 Bundle) - September 25th
500GB - $299 - October 30th
Europe and PAL Territories
Flash Memory 12GB - 229 Euros, AUD $299.95, NZD $399.95 - October 12th (September 27th AU, October 18th NZ)
500GB - 299 Euros, AUD $399.95, NZD $519.95 - September 28th (September 27th ANZ)
Japan
250GB - 24,900 Yen - October 4th
500GB - 29,800 Yen - October 4th