"The bad news for storage-hungry PS3 fans is that, so far, Sony has only confirmed a launch date – 17 December - for the 250GB model in its native Japan."
Everyone knows, surely, that you can fit whatever size HDD you want. The handbook shows you how to do it, and it does not affect your warranty,,,
a 500GB PS3 upgrade is £60. (Western Digital Scorpio 2.5in SATA 500GB)