Very long and quite in depth preview here
http://multiplayer.it/articoli/140123-grand-theft-auto-v-gta-5-il-gioco-dei-giochi.html
in italian.
- more than double the draw distance. very little pop in making the world look very solid and believable.
- much more stable 30fps
- 3 times the light sources
- improved DOF with bokeh
- foliage now moves more realistically from wind / characters
- much higher res textures, much more diversity in ads / billboards
- rain progressively forms water puddles, everything is reflected on them (SSR ?)
the 'not so good'
- there still is some draw in
- IQ IS NOT PERFECT. They assume the game is probably using some post processing AA solution, which doesn't completely get rid of minor jaggies. IQ is not razor sharp.
Build was 8 weeks old though.
First person
- You can go TOTAL 1st person (that is, camera doesn't switch to 3rd even when rolling on the ground/down a hill, or going into cover etc) or dynamic.
- they said NO 1st person during cutscenes.
- YOU CAN ADJUST FOV hadn't heard of this before. Toggle head bobbling on/off etc.
- Basically change everything about the control scheme to suit your tastes
- walking physics have been adjusted for 1st person, game now has over 3000 new animations for the main characters (reloading weapons, using phone etc)
- Because of FPV, now NPC's have a wider range of facial expressions, since you're supposed to be looking at their faces.
That's more or less it.