In RFOM, you could wall hack, but you have to equip the Auger which also allows you to shoot through walls. The wall remains intact.
In addition, you could break the SPU "nextgen" glass.
It's one of the rare SPU uses at launch. I heard RFOM was mainly done without much SPU help though.
KZ2 had just a little breakable stuff (e.g., the concrete pillars in Radec Academy), and scripted destruction. In the above section, it looks like we could walk though the destroyed wall. I remember GG's CEO spoke briefly about more destructibility (and more open levels). But they have showed rather little KZSF features to date.
EDIT:
KZ2 had some destructible geometry like pillars, glass etc so nothing new there. I'd be surprised if KZSF did not have some level of environmental destruction. Every upcoming nextgen FPS should have it as standard in IMO....same with racing games and car damage.
Yes, I think you can shoot through wooden windows in KZ2 also. But window destruction was rather simple as you may have guessed.
A better comparison may be KZ3 jungle vs KZSF forest level. The scope is on a different level. We will need to see the final AI to get a sense of how the combat works (e.g., 8 on-screen AI vs 24 on-screen AI in KZSF before slowing down).
In MP, KZSF should be 60fps (1080p ?). KZ3 is 30fps 720p.
On top of all these, the PS4 games are supposed to support video recording, spectating, and some sort of remote assistance. I don't know if all these features will be available at launch. But you can get a better perspective of how they (intend to) deploy their computing resources at run-time.
The PS3 could run PlayTV together with some games.
