well they are concentrating on the game and physics so i expect to see tons of features added to Gran turismo 5 to make it better along the years while Gran turismo 6 is in development ( if it took GT5 6 years of development, who knows how much longer it will take GT6 if it ever comes out for PS3, or is developed to be a launch title for the PS4)
But the problem i see with a livery editor is that, The developers of Forza and all the Xbox fan-boys will no doubt be like "look GT5 has a livery editor, they copied FORZA!!! THEY ARE UNORIGINAL!!!" etc etc. Just like they did with the Wii controller and the Six-axis motion controller! and i can imagine it being with the same with the livery editor.
But the problem i see with a livery editor is that, The developers of Forza and all the Xbox fan-boys will no doubt be like "look GT5 has a livery editor, they copied FORZA!!! THEY ARE UNORIGINAL!!!" etc etc. Just like they did with the Wii controller and the Six-axis motion controller! and i can imagine it being with the same with the livery editor.