The following is Open Game Content from a 3PP Source
Iaijutsu (Ex): Iaijutsu is the art of sword-drawing. At 2nd level, the samurai gains the Quick Draw feat and Weapon Focus in either katana or ko-dachi (a slightly shorter blade), and receives a +1 to initiative. The initiative bonus increases by another +1 at 5th, 8th, 11th, 14th, 17th, and 20th levels. This initiative bonus does not stack with the Improved Critical feat.
At 11th level, the samurai gains Advanced Style in battojutsu, the art of cutting, improving their critical threat range with the katana or ko-dachi by 1 (for example, from a standard 19-20 to an 18-20). At 14th, 17th, and 20th levels the critical threat range increases by another 1 (so that the example 19-20 standard critical threat range would be 15-20 at 20th level). The effects of battojutsu do not stack with the Improved Critical feat.
Iaijutsu practitioners are extremely deadly with their chosen blade but their narrow focus leaves them lacking versatility. Iaijutsu combat style feats must be chosen from the following: Reverse Draw, Sitting Draw, Turning Draw, Tameshigiri, Kabuto Wari, Raijukengiri, Senbongiri, Swallow-Tail Cut.