Possible platform specific features - Jai-JAP/re-GTA GitHub Wiki
Xbox III and VC:
screen droplets (aap),what about blood? (TAG?)- cutscene hands (aap or Fire_Head)
- particles (probably Fire_Head)
- make custom pipes work with new renderer (and port to re3)
- menu? probably not though
Xbox vehicle pipe:
- render less expensive and better env map
- possibly even a sphere map
Mobile:
- matfx maybe?