The P-11 is a design that has been around since 1995. The trigger is fairly long and heavy (8.5 pounds), a lot like a DA revolver. It will hold 12+1 rounds of +P ammo with LEO-only flush-fit mags. It can also use S&W 59 and 69 series mags, and KT offers grip adapters. It makes a very comfortable IWB carry, due to its light weight.
The PF-9 is about to be introduced after some supplier-related delays (Sept. 1st). It uses some P-11 parts (including the barrel and recoil springs) and the trigger is designed around the lighter mechanism (5-6 pounds) of the small P-32 and P-3AT pocket pistols. Capacity is 7+1 rounds of +P. Size is similar to a Kahr PM9; and can be carried in large pockets or as a very thin/light IWB pistol.
Both pistols come in Blued, Parkerized, and Hard Chrome finishes. "Blued" finish has an "in the white" barrel. Grips (the whole plastic lower half of the pistol) are available in Black, Gray, and OD Green, and can be changed to different colors at a later time if desired.
A good price for a NIB Blued P-11 pistol is $230-$240, with the Parked and Hard Chrome running about $35 and $70 more respectively. The PF-9 is priced the same as the P-11 by Kel-Tec, but demand will likely make them more expensive for a while.