If it's not going to sell well on the DS, then maybe it will do well on the PSP. VideoGamer.com has word from Rockstar saying that
Grand Theft Auto: Chinatown Wars will be coming to the PSP. Seeing as how the game didn't do so hot on the DS, I'm interested to see if it will be a bigger seller on the PSP as that handheld seems to cater more towards the gamer looking for mature titles. I think it's a good decision to try and make it for another platform and see how it goes. You'll be getting new graphics, new animations, and new missions as well over the original DS release.