I have a feeling it isn't going to be fixed. I'm not sure if they're just not seeing it or if they really can't solve it but it's very annoying.
I will say that, despite the fact that it drives me nuts, I've still managed to have a really good time with the game. It's good enough to overcome that but, man, it really could use a fix.
It's definitely not related to background streaming or demands on the system either. If you go to Hunter's Dream and stand in the middle spinning the camera you'll find that every 5 seconds or so you get a couple seconds of messed up frame times.