Jedi Aayla Secura is currently exclusive to set 8098, Clone Turbo Tank. This is the first time that Aayla, or a female Twi'lek minifigure, has appeared in the LEGO universe.
Minifigure Parts and Accessories
Aayla is composed of four parts: head piece, head, torso and legs. The mystery of the head was solved when a picture surfaced on Eurobricks showing the headgear and tails are removable, leaving a standard, medium blue minifig head behind.
The torso is medium blue and has a custom female print. There is one medium blue arm, and one dark brown arm. As you can see from the reference photo, this matches Aayla's normal garb. There's also print on the back of the torso
The legs are dark brown with no additional print.
Aayla's accessory is a standard, blue lightsaber.
Army Building Potential
The new head assembly is a big draw, but the high cost of the Clone Turbo Tank (~$120 USD) is going to bump the ABP for this figure to moderate.
The female twi'lek head assembly is the big draw here. Prior to this official LEGO minifigure you could only get customs by Arealight.
(Pictures from Brickshelf and Wookiepedia)