David Reeves (SCEE) last month:

GS UK: What's the incentive to buy a 40GB PlayStation 3, given that there's no price reduction?

DR: Well there's virtually no 40GB models left. You'll probably find that you'll have to scrape around going from shop to shop to even find a PS3, even now. Now when you come to August 27, all you'll find is an 80GB model. So we have planned this, seriously, for the last eight months, and we've run down the stocks of the 40GB knowing we will introduce the 80GB. If the 40GB is still there we will add a piece of software or an extra DualShock 3 [controller] to it to move it through, and we say good-bye to the 40GB, hello to the 80GB.