I believe what he means by this is that the components in the dev kits are surrounded by bigger cases than in retail units.
Maybe he is worried about not seeing a fully functional PS4 because of how small the case is and he thinks that it might have heating issues. ala xbox 360 launch units.
Nobody's perfect. I aint nobody!!!
Killzone 2. its not a fps. it a FIRST PERSON WAR SIMULATOR!!!! ..The true PLAYSTATION 3 launch date and market dominations is SEP 1st