Well what I saw on the gametrailers interview, was that guerilla were finishing up the game, and realized the SPU's had alot more to offer, so that improvement your seeing from 07-08 is a sginificant improvement, and there are even more things on screen than before, they then stated that it barely touched 60% of the max the SPU's can emit on screen, so basically they said if they finish the game early, and have enhanced the gameplay enough, they will work on adding even more things to the visuals, and polishing them up even more, honestly if killzone 2 had another year until holidays 09, it would look even better than it does now.
They also said as they continue to optimize there engine for the ps3's architecture, they continue to see an improvement in visuals, performence, etc.. on screen as they get the general aspect of the CPU.
