Hey Nifft!
I just threw a look over the Dancing Fox discipline.
One thing I noted about this discipline is that it supplements an attrition style. One-on-one, no single foe of equal level is going to hit you because of the mirror images. (And even if they do pick the right one, they still have to hit your AC)
The next is that this discipline synergies well with all the others, especially Stone Dragon. Stone Dragon is about taking hits and dishing it out. What could be better for a tank than only getting hit 1/13 times? Oh, wait, forcing your foes to waste time trying to hit you.
In all, it depends on what kind of class can take this discipline. A beefy tank type like Warblade (some say it's not a very good tank, but it depends on how much magic is availible) or Crusader is going to get a whole lot of mileage out of it. A rogue or monk-ish type will find it a lifesaver, but not particularly overpowering. This discipline looks like a rogue-type, and fits well with the other disciplines.
That said, about the individual maneuvers:
"Foxy Fall" (I think it needs a better name) - Do you get a benefit or does the foe need to make a save? Theres a Tactical Feat in, I think, PHB2 that has a benefit like this.
"Blazing Foxfire" - It can daze for multiple rounds? Ouch. Seems pretty rough, depending on how many rounds it is.
"Braggart's Bait" - I take it this works like the Knight class ability? (Where they must choose you as the target of their attacks, but are still free to conduct their combat competently)
Overall, looks good but the writeups are, as always, the clincher.