Just read IGN's preview. Seems there's still pop-up in it. That was the one thing I absolutely hated about GTA. Let's hope they'll fix it in the final version, but I don't have a lot of hope in it.
I remember I saw a preview of San Andreas and there was virtually no pop-up there, but in the final game the bushes popped up a foot in front of you.
Havok: 360 screens, as R* said that the PS3 version was a week or two behind.