Well we know the big 4 are IN, and it's really only a matter of when rather than if regarding David Ferrer.
Fish is in good terrain, as while his form isn't that good outside of America, he doesn't need to produce much fireworks. Tsonga appears to be in hot form atm - he should qualify too, and being French is only a good thing in the late season run home.
Berdych - depends on the shoulder. He's good indoors, but his retirement in the US Open....
Almagro - his optionals are fairly full, and he's pretty shit when not on clay. Not looking good.
Soderling - depends on how he comes back from mono. He's still very dangerous indoors, so his chances if he gets fit are pretty good.
Simon - doesn't have the 500 restrictions, and gets some HGA in later weeks. Probably the best chance of qualifying outside of the top 8.
Del Potro - ordinarily would be looking good, but his form has been pretty ordinary in recent weeks.
Tipsaveric - in the mix. Hasn't won a title, and is in good form. He probably needs to step up if he wants to qualify however, and I doubt that he has that in him...
Monfils - typically does very good indoors, so has a better chance than his race ranking may say.
Gasquet - not beyond him, but he really needs a title to get some momentum.
Dolgopolov - not likely. He's inexperienced indoors, and he's still pretty inconsistent. 2012 holds better opportunities.
Troicki - been playing really weird lately, and is probably too far back anyway.
Wawrinka - ditto.
Roddick - needs a big Autumn, and I dunno if he has it in him anymore.
Isner - not good enough to have an Autumn that would get him over the line.
Verdasco - out of nick, and optionals are relatively full. No real chance.
