Straight. I heard from someone a couple days ago that said they played with the track bar and it didn't do anything.
Unless whoever you heard from has an adjustable track bar for a JL, they are a moron who doesn't know anything about Jeeps and you shouldn't listen to them.
I'd still like to see for myself, though. The axles are perfectly aligned on both sides, so the lift didn't change anything there. I'd hate to adjust the track bar and fix the spring, then discover my tire sticks out 1/4" or so more on one side than the other.
Unless you installed an adjustable front track bar or a track bar relocation bracket with a drag link flip, it would be impossible to not see any change. Your track bar is like the hypotenuse of a right angle triangle. If you increase the height of the triangle but keep the hypotenuse and the base the same length, the base of it MUST SHIFT. Of course, you will now have more of an acute scalene triangle and that will cause a spring to bow.
I've also seen another with the 2" lift whose driver side is straigt, but the passenger side has a very slight bow. Most appear to be on the driver's side.
If what you've seen is really true, the Jeep in question must have an adjustable track bar installed with too much correction set.