Why do you care what they call the game if it's basically the same game?Then don't do an infamous .. I'm all for a new portable IP...
ANd besides isn't gravity daze doing it ( open world ) pretty well ? ( asking here since i didn't have a moment to test the game )
And I have no idea if GR is open world, or if it's good. I know a lot of people claimed GTA was good on PSP, and those games are terrible.