Maybe they'll refine the engine over coming months and improves some of the enivromental details e.g. rain/sand etc... if it is possibe for them to do it on PC/PS4 hopefully they will, they could perhaps omit/disable the improved animations from the PS3 build like how they've capped the visable characters/NPCs on displayed on screen.

Im perfectly willing to accept a two tier game (in graphical/animation terms) due the PS3s limitations compared to the other platforms.

But I know nothing of game design or of how ARR was built so I dont know if what I suggested is even possible.